diff --git a/checks/raw/security_policy.go b/checks/raw/security_policy.go
index 86fc7e87919..9469d625c8a 100644
--- a/checks/raw/security_policy.go
+++ b/checks/raw/security_policy.go
@@ -143,6 +143,9 @@ func isSecurityPolicyFilename(name string) bool {
 	return strings.EqualFold(name, "security.md") ||
 		strings.EqualFold(name, ".github/security.md") ||
 		strings.EqualFold(name, "docs/security.md") ||
+		strings.EqualFold(name, "security.markdown") ||
+		strings.EqualFold(name, ".github/security.markdown") ||
+		strings.EqualFold(name, "docs/security.markdown") ||
 		strings.EqualFold(name, "security.adoc") ||
 		strings.EqualFold(name, ".github/security.adoc") ||
 		strings.EqualFold(name, "docs/security.adoc") ||
diff --git a/checks/raw/security_policy_test.go b/checks/raw/security_policy_test.go
index f9c98caa984..67abd80ca2f 100644
--- a/checks/raw/security_policy_test.go
+++ b/checks/raw/security_policy_test.go
@@ -93,6 +93,27 @@ func TestSecurityPolicy(t *testing.T) {
 			},
 			path: "",
 		},
+		{
+			name: "security.markdown",
+			files: []string{
+				"security.markdown",
+			},
+			path: "",
+		},
+		{
+			name: ".github/security.markdown",
+			files: []string{
+				".github/security.markdown",
+			},
+			path: "",
+		},
+		{
+			name: "docs/security.markdown",
+			files: []string{
+				"docs/security.markdown",
+			},
+			path: "",
+		},
 		{
 			name: "docs/security.rst",
 			files: []string{