diff --git a/launcher/Assert.h b/launcher/Assert.h
index df15ed389..0b1cdb742 100644
--- a/launcher/Assert.h
+++ b/launcher/Assert.h
@@ -18,6 +18,8 @@
 
 #pragma once
 
-#if !defined(ASSERT_NEVER)
-#define ASSERT_NEVER(cond) (Q_ASSERT(cond == false), cond)
+#if defined(ASSERT_NEVER)
+#error ASSERT_NEVER already defined
+#else
+#define ASSERT_NEVER(cond) (Q_ASSERT((cond) == false), (cond))
 #endif