diff --git a/src/DotSwashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/SwaggerGenerator.cs b/src/DotSwashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/SwaggerGenerator.cs
index 08864f0282..9744df222b 100644
--- a/src/DotSwashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/SwaggerGenerator.cs
+++ b/src/DotSwashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/SwaggerGenerator.cs
@@ -408,14 +408,15 @@ private OpenApiParameter GenerateParameter(
 
             var isRequired = apiParameter.IsRequiredParameter();
 
-            var schema = apiParameter.ModelMetadata != null
-                ? GenerateSchema(
-                    apiParameter.Type,
-                    schemaRepository,
-                    apiParameter.PropertyInfo(),
-                    apiParameter.ParameterInfo(),
-                    apiParameter.RouteInfo)
-                : new OpenApiSchema { Type = "string" };
+            var type = apiParameter.ModelMetadata?.ModelType ?? apiParameter.Type;
+
+            var schema = type != null ? GenerateSchema(
+                type,
+                schemaRepository,
+                apiParameter.PropertyInfo(),
+                apiParameter.ParameterInfo(),
+                apiParameter.RouteInfo
+            ) : new OpenApiSchema() {Type = "string"};
 
             var parameter = new OpenApiParameter
             {
@@ -513,11 +514,13 @@ private OpenApiRequestBody GenerateRequestBodyFromBodyParameter(
 
             var isRequired = bodyParameter.IsRequiredParameter();
 
-            var schema = GenerateSchema(
-                bodyParameter.Type,
+            var type = bodyParameter.ModelMetadata?.ModelType ?? bodyParameter.Type;
+            var schema = type != null ? GenerateSchema(
+                type,
                 schemaRepository,
                 bodyParameter.PropertyInfo(),
-                bodyParameter.ParameterInfo());
+                bodyParameter.ParameterInfo()
+            ) : new OpenApiSchema() { Type = "string" };
 
             return new OpenApiRequestBody
             {
@@ -591,13 +594,13 @@ private OpenApiSchema GenerateSchemaFromFormParameters(
                     ? formParameter.Name.ToCamelCase()
                     : formParameter.Name;
 
-                var schema = formParameter.ModelMetadata != null
-                    ? GenerateSchema(
-                        formParameter.Type,
-                        schemaRepository,
-                        formParameter.PropertyInfo(),
-                        formParameter.ParameterInfo())
-                    : new OpenApiSchema { Type = "string" };
+                var type = formParameter.ModelMetadata?.ModelType ?? formParameter.Type;
+                var schema = type != null ? GenerateSchema(
+                    type,
+                    schemaRepository,
+                    formParameter.PropertyInfo(),
+                    formParameter.ParameterInfo()
+                ) : new OpenApiSchema() { Type = "string" };
 
                 properties.Add(name, schema);
 
diff --git a/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/Fixtures/FakeController.cs b/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/Fixtures/FakeController.cs
index e4cb622c4e..0ba04931a7 100644
--- a/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/Fixtures/FakeController.cs
+++ b/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/Fixtures/FakeController.cs
@@ -1,6 +1,7 @@
 using System;
 using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
+using DotSwashbuckle.AspNetCore.TestSupport;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.ModelBinding;
@@ -19,6 +20,11 @@ public void ActionWithNoParameters()
         public void ActionWithParameter(string param)
         { }
 
+        public IntEnum ActionWithEnumParameter(IntEnum param)
+        {
+            return param;
+        }
+
         public void ActionWithMultipleParameters(string param1, int param2)
         { }
 
diff --git a/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs b/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs
index 4636ace24c..832a35a598 100644
--- a/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs
+++ b/test/DotSwashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs
@@ -370,6 +370,109 @@ public void GetSwagger_SetsOperationIdToNull_IfActionHasNoEndpointMetadata()
             Assert.Null(document.Paths["/resource"].Operations[OperationType.Post].OperationId);
         }
 
+        [Fact]
+        public void GetSwagger_SetsEnumRef_IfParameterIsEnum()
+        {
+            var methodInfo = typeof(FakeController).GetMethod(nameof(FakeController.ActionWithEnumParameter));
+            var actionDescriptor = new ActionDescriptor
+            {
+                EndpointMetadata = null,
+                RouteValues = new Dictionary<string, string>(StringComparer.Ordinal)
+                {
+                    ["controller"] = methodInfo.DeclaringType.Name.Replace("Controller", string.Empty)
+                }
+            };
+            var subject = Subject(
+                apiDescriptions: new[]
+                {
+                    ApiDescriptionFactory.Create(actionDescriptor, methodInfo, groupName: "v1", httpMethod: "POST",
+                        relativePath: "resource",
+                        parameterDescriptions: new[]
+                        {
+                            new ApiParameterDescription
+                            {
+                                Name = "param",
+                                Source = BindingSource.Query,
+                                Type = typeof(string), // The type comes as string
+                                ModelMetadata = ModelMetadataFactory.CreateForType(typeof(IntEnum)),
+                            }
+                        },
+                        supportedResponseTypes: new []
+                        {
+                            new ApiResponseType
+                            {
+                                ApiResponseFormats = new [] { new ApiResponseFormat { MediaType = "application/json" } },
+                                StatusCode = 200,
+                            },
+                        }
+                    )
+                }
+            );
+
+            var document = subject.GetSwagger("v1");
+
+            var operation = document.Paths["/resource"].Operations[OperationType.Post];
+
+
+            Assert.Equal("IntEnum", operation.Responses["200"].Content.First().Value.Schema.Reference.Id);
+            Assert.Equal("IntEnum", operation.Parameters.First().Schema.Reference.Id);
+            Assert.Equal(ReferenceType.Schema, operation.Parameters.First().Schema.Reference.Type);
+            Assert.Equal(3, document.Components.Schemas["IntEnum"].Enum.Count);
+        }
+
+        [Fact]
+        public void GetSwagger_SetsEnumRef_IfRequestBodyIsEnum()
+        {
+            var methodInfo = typeof(FakeController).GetMethod(nameof(FakeController.ActionWithEnumParameter));
+            var actionDescriptor = new ActionDescriptor
+            {
+                EndpointMetadata = null,
+                RouteValues = new Dictionary<string, string>(StringComparer.Ordinal)
+                {
+                    ["controller"] = methodInfo.DeclaringType.Name.Replace("Controller", string.Empty)
+                }
+            };
+            var subject = Subject(
+                apiDescriptions: new[]
+                {
+                    ApiDescriptionFactory.Create(actionDescriptor, methodInfo, groupName: "v1", httpMethod: "POST",
+                        relativePath: "resource",
+                        parameterDescriptions: new[]
+                        {
+                            new ApiParameterDescription
+                            {
+                                Name = "param",
+                                Source = BindingSource.Body,
+                                Type = typeof(string), // The type comes as string
+                                ModelMetadata = ModelMetadataFactory.CreateForType(typeof(IntEnum)),
+                            }
+                        },
+                        supportedRequestFormats: new[]
+                        {
+                            new ApiRequestFormat { MediaType = "application/json" }
+                        },
+                        supportedResponseTypes: new []
+                        {
+                            new ApiResponseType
+                            {
+                                ApiResponseFormats = new [] { new ApiResponseFormat { MediaType = "application/json" } },
+                                StatusCode = 200,
+                            },
+                        }
+                    )
+                }
+            );
+
+            var document = subject.GetSwagger("v1");
+
+            var operation = document.Paths["/resource"].Operations[OperationType.Post];
+
+
+            Assert.Equal("IntEnum", operation.Responses["200"].Content.First().Value.Schema.Reference.Id);
+            Assert.Equal("IntEnum", operation.RequestBody.Content.First().Value.Schema.Reference.Id);
+            Assert.Equal(3, document.Components.Schemas["IntEnum"].Enum.Count);
+        }
+
         [Fact]
         public void GetSwagger_SetsDeprecated_IfActionHasObsoleteAttribute()
         {
diff --git a/test/WebSites/Basic/Controllers/CrudActionsController.cs b/test/WebSites/Basic/Controllers/CrudActionsController.cs
index 3e13b7ffdf..b5e38e2460 100644
--- a/test/WebSites/Basic/Controllers/CrudActionsController.cs
+++ b/test/WebSites/Basic/Controllers/CrudActionsController.cs
@@ -86,6 +86,17 @@ public void Patch(int id, [FromBody, Required]IDictionary<string, object> update
         public void Delete(int id)
         {
         }
+
+        [HttpGet("status", Name = "GetStatus")]
+        public void GetStatus(ProductStatus status)
+        {
+        }
+
+        [HttpPost("status", Name = "GetStatus")]
+        public ProductStatus PostStatus([FromBody] ProductStatus status)
+        {
+            return status;
+        }
     }
 
     public enum ProductStatus