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-rw-r--r--include/c11/threads_win32.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/c11/threads_win32.h b/include/c11/threads_win32.h
index 5298a84321d..d017c31c34e 100644
--- a/include/c11/threads_win32.h
+++ b/include/c11/threads_win32.h
@@ -296,7 +296,7 @@ static void impl_tss_dtor_invoke()
static inline void
call_once(once_flag *flag, void (*func)(void))
{
- assert(!flag && !func);
+ assert(flag && func);
#ifdef EMULATED_THREADS_USE_NATIVE_CALL_ONCE
{
struct impl_call_once_param param;