diff --git a/libc/bionic/semaphore.c b/libc/bionic/semaphore.c
index f4eebce..84b9314 100644
--- a/libc/bionic/semaphore.c
+++ b/libc/bionic/semaphore.c
@@ -180,7 +180,7 @@
     if (sem == NULL)
         return EINVAL;
 
-    if (__atomic_inc((volatile int*)&sem->count) == 0)
+    if (__atomic_inc((volatile int*)&sem->count) >= 0)
         __futex_wake(&sem->count, 1);
 
     return 0;