diff --git a/src/ca65/token.h b/src/ca65/token.h
index 7a85fe4af..c5fe629eb 100644
--- a/src/ca65/token.h
+++ b/src/ca65/token.h
@@ -277,7 +277,7 @@ INLINE int TokIsSep (enum Token T)
     return (T == TOK_SEP || T == TOK_EOF);
 }
 #else
-#  define TokIsSep(T)   (T == TOK_SEP || T == TOK_EOF)
+#  define TokIsSep(T)   ((T) == TOK_SEP || (T) == TOK_EOF)
 #endif