diff --git a/libisofs/messages.c b/libisofs/messages.c
index cc9bf74..a7b36f6 100644
--- a/libisofs/messages.c
+++ b/libisofs/messages.c
@@ -480,7 +480,7 @@ int iso_msg_submit(int imgid, int errcode, int causedby, const char *fmt, ...)
     va_list ap;
 
     /* when called with ISO_CANCELED, we don't need to submit any message */
-    if (errcode == ISO_CANCELED && fmt == NULL) {
+    if (errcode == (int) ISO_CANCELED && fmt == NULL) {
         return ISO_CANCELED;
     }