diff --git a/libc/bionic/pthread_mutex.cpp b/libc/bionic/pthread_mutex.cpp
index d9ddf10..f92184e 100644
--- a/libc/bionic/pthread_mutex.cpp
+++ b/libc/bionic/pthread_mutex.cpp
@@ -199,6 +199,8 @@
                                                                    memory_order_relaxed))) {
             return 0;
         }
+    } else {
+        old_owner = atomic_load_explicit(&mutex.owner_tid, memory_order_relaxed);
     }
 
     if (tid != (old_owner & FUTEX_TID_MASK)) {