1 files changed, 6 insertions, 1 deletions
diff --git a/src/Common/src/TypeSystem/Interop/IL/MarshalHelpers.cs b/src/Common/src/TypeSystem/Interop/IL/MarshalHelpers.cs
index a65a6a3a6..00ba8fda5 100644
--- a/src/Common/src/TypeSystem/Interop/IL/MarshalHelpers.cs
+++ b/src/Common/src/TypeSystem/Interop/IL/MarshalHelpers.cs
@@ -66,8 +66,13 @@ namespace Internal.TypeSystem.Interop
                 typeDesc = typeDesc.GetParameterType();
             }
 
-            if (typeDesc.Category != TypeFlags.ValueType)
+            typeDesc = typeDesc.UnderlyingType;
+
+            // TODO: There are primitive types which require marshalling, such as bool, char.
+            if (typeDesc.IsPrimitive)
+            {
                 return false;
+            }
 
             MetadataType type = typeDesc as MetadataType;
             if (type == null)