diff --git a/nsxt/resource_nsxt_policy_gateway_route_map.go b/nsxt/resource_nsxt_policy_gateway_route_map.go
index 364a10b75..00aec105d 100644
--- a/nsxt/resource_nsxt_policy_gateway_route_map.go
+++ b/nsxt/resource_nsxt_policy_gateway_route_map.go
@@ -103,7 +103,7 @@ func getPolicyRouteMapEntrySchema() *schema.Resource {
 						"as_path_prepend": {
 							Type:         schema.TypeString,
 							Optional:     true,
-							ValidateFunc: validateASPlainOrDot,
+							ValidateFunc: validateASPath,
 							Description:  "Autonomous System (AS) path prepend to influence route selection",
 						},
 						"community": {
diff --git a/nsxt/resource_nsxt_policy_gateway_route_map_test.go b/nsxt/resource_nsxt_policy_gateway_route_map_test.go
index b2141120d..373494fb0 100644
--- a/nsxt/resource_nsxt_policy_gateway_route_map_test.go
+++ b/nsxt/resource_nsxt_policy_gateway_route_map_test.go
@@ -173,7 +173,7 @@ resource "nsxt_policy_gateway_route_map" "test" {
     }
 
     set {
-      as_path_prepend           = "12.998"
+      as_path_prepend           = "100 100"
       community                 = "11:22"
       local_preference          = 1122
       med                       = 120
diff --git a/nsxt/validators.go b/nsxt/validators.go
index 4e13b1ba6..b0e1c7908 100644
--- a/nsxt/validators.go
+++ b/nsxt/validators.go
@@ -503,6 +503,21 @@ func validateASPlainOrDot(i interface{}, k string) (s []string, es []error) {
 	return
 }
 
+func validateASPath(i interface{}, k string) (s []string, es []error) {
+	v, ok := i.(string)
+	if !ok {
+		es = append(es, fmt.Errorf("String is expected, got %s", v))
+		return
+	}
+
+	tokens := strings.Split(v, " ")
+	for _, token := range tokens {
+		s, es = validateASPlainOrDot(token, k)
+	}
+
+	return
+}
+
 func validatePolicyBGPCommunity(i interface{}, k string) (s []string, es []error) {
 	v, ok := i.(string)
 	if !ok {