diff --git a/src/mono/System.Private.CoreLib/src/System/RuntimeType.Mono.cs b/src/mono/System.Private.CoreLib/src/System/RuntimeType.Mono.cs
index eed3d75c60bd5..08484d246a504 100644
--- a/src/mono/System.Private.CoreLib/src/System/RuntimeType.Mono.cs
+++ b/src/mono/System.Private.CoreLib/src/System/RuntimeType.Mono.cs
@@ -1277,7 +1277,7 @@ protected override bool IsValueTypeImpl()
         public override bool IsEnum => GetBaseType() == EnumType;
 
         // Returns true for actual enum types only.
-        internal bool IsActualEnum => RuntimeTypeHandle.GetBaseType(this) == EnumType;
+        internal bool IsActualEnum => !IsGenericParameter && RuntimeTypeHandle.GetBaseType(this) == EnumType;
 
         public override GenericParameterAttributes GenericParameterAttributes
         {