diff --git a/src/dbginfo/dbginfo.c b/src/dbginfo/dbginfo.c
index 16bc9d9de..05951f6c6 100644
--- a/src/dbginfo/dbginfo.c
+++ b/src/dbginfo/dbginfo.c
@@ -2933,7 +2933,7 @@ static void ParseCSym (InputData* D)
     }
 
     /* Symbol only valid if storage class not auto */
-    if (((InfoBits & ibSymId) != 0) != (SC != CC65_CSYM_AUTO)) {
+    if (((InfoBits & ibSymId) != 0) && (SC == CC65_CSYM_AUTO)) {
         ParseError (D, CC65_ERROR, "Only non auto symbols can have a symbol attached");
         goto ErrorExit;
     }