diff --git a/common.h b/common.h
index 6b751ba..e1e297f 100644
--- a/common.h
+++ b/common.h
@@ -10,7 +10,7 @@
 
 #define ASSERT(message, body) \
 	{ \
-		if (!body) \
+		if (!(body)) \
 			THROW("Assert failed: " message " [" #body "]"); \
 	}