1 files changed, 1 insertions, 1 deletions
diff --git a/compat.c b/compat.c
index 2b00142..f4d82a6 100644
--- a/compat.c
+++ b/compat.c
@@ -274,7 +274,7 @@ AddGroupCompat(CompatInfo * info, unsigned group, GroupCompatInfo * newGC)
     {
         return True;
     }
-    if (((gc->fileID == newGC->fileID) && (warningLevel > 0))
+    if (((gc->defined && gc->fileID == newGC->fileID) && (warningLevel > 0))
         || (warningLevel > 9))
     {
         WARN1("Compat map for group %d redefined\n", group + 1);