diff --git a/include/proto/shctx.h b/include/proto/shctx.h
index f5448e0..ea62a12 100644
--- a/include/proto/shctx.h
+++ b/include/proto/shctx.h
@@ -93,6 +93,8 @@
         for (i = 0; i < *count; i++) {
                 relax();
                 relax();
+		if (*uaddr != value)
+			return;
         }
         *count = *count << 1;
 }