diff --git a/src/cc65/compile.c b/src/cc65/compile.c
index 596988036..77abffb43 100644
--- a/src/cc65/compile.c
+++ b/src/cc65/compile.c
@@ -107,7 +107,8 @@ static void Parse (void)
 	ParseDeclSpec (&Spec, SC_EXTERN | SC_STATIC, T_INT);
 
 	/* Don't accept illegal storage classes */
-	if (Spec.StorageClass == SC_AUTO || Spec.StorageClass == SC_REGISTER) {
+       	if ((Spec.StorageClass & SC_AUTO) != 0 || 
+            (Spec.StorageClass & SC_REGISTER) != 0) {
 	    Error ("Illegal storage class");
 	    Spec.StorageClass = SC_EXTERN | SC_STATIC;
 	}