diff --git a/src/random.c b/src/random.c
index e47946a6..0b44c8b9 100644
--- a/src/random.c
+++ b/src/random.c
@@ -239,7 +239,7 @@ static bool os_random_buf(void* buf, size_t buf_len) {
   if (mi_atomic_load_acquire(&no_getrandom)==0) {
     ssize_t ret = syscall(SYS_getrandom, buf, buf_len, GRND_NONBLOCK);
     if (ret >= 0) return (buf_len == (size_t)ret);
-    if (ret != ENOSYS) return false;
+    if (errno != ENOSYS) return false;
     mi_atomic_store_release(&no_getrandom, 1UL); // don't call again, and fall back to /dev/urandom
   }
 #endif