diff --git a/dlls/msvcp140_atomic_wait/main.c b/dlls/msvcp140_atomic_wait/main.c
index f27c1058d14..a4ea3d619f5 100644
--- a/dlls/msvcp140_atomic_wait/main.c
+++ b/dlls/msvcp140_atomic_wait/main.c
@@ -68,3 +68,9 @@ void __stdcall __std_atomic_notify_one_direct(void *addr)
     TRACE("(%p)\n", addr);
     WakeByAddressSingle(addr);
 }
+
+void __stdcall __std_atomic_notify_all_direct(void *addr)
+{
+    TRACE("(%p)\n", addr);
+    WakeByAddressAll(addr);
+}
diff --git a/dlls/msvcp140_atomic_wait/msvcp140_atomic_wait.spec b/dlls/msvcp140_atomic_wait/msvcp140_atomic_wait.spec
index f28cfe9513c..0c99585c057 100644
--- a/dlls/msvcp140_atomic_wait/msvcp140_atomic_wait.spec
+++ b/dlls/msvcp140_atomic_wait/msvcp140_atomic_wait.spec
@@ -2,7 +2,7 @@
 @ stub __std_atomic_compare_exchange_128
 @ stub __std_atomic_get_mutex
 @ stub __std_atomic_has_cmpxchg16b
-@ stub __std_atomic_notify_all_direct
+@ stdcall __std_atomic_notify_all_direct(ptr)
 @ stub __std_atomic_notify_all_indirect
 @ stdcall __std_atomic_notify_one_direct(ptr)
 @ stub __std_atomic_notify_one_indirect