diff --git a/orbis-kernel/src/umtx.cpp b/orbis-kernel/src/umtx.cpp
index efd3e857e..308a7cca0 100644
--- a/orbis-kernel/src/umtx.cpp
+++ b/orbis-kernel/src/umtx.cpp
@@ -48,7 +48,7 @@ uint UmtxChain::notify_n(const UmtxKey &key, sint count) {
     n++;
     count--;
 
-    if (it == sleep_queue.end()) {
+    if (it->first != key || it == sleep_queue.end()) {
       break;
     }
   }