diff --git a/src/uniproc_win64.c b/src/uniproc_win64.c
index eadba5b..2535e75 100644
--- a/src/uniproc_win64.c
+++ b/src/uniproc_win64.c
@@ -191,7 +191,7 @@ int uniproc_are_processes_finished(const uniproc_process* p, const size_t num_pr
 		h[i] = (HANDLE)p[i]._proc_hdl;
 		num_valid_handles++;
 	}
-	if (num_valid_handles == 0) return true;
+	if (num_valid_handles == 0) return 1;
 	DWORD ret = WaitForMultipleObjects(num_valid_handles, h, 1, 0);
 	free(h);
 	return ret >= WAIT_OBJECT_0 && ret < WAIT_OBJECT_0 + num_valid_handles;