diff --git a/src/base_core.h b/src/base_core.h
index 06be6cc..31bde68 100644
--- a/src/base_core.h
+++ b/src/base_core.h
@@ -190,7 +190,7 @@ typedef unsigned __int128 U128;
 ({                                    \
     __typeof__(x) _x   = (x);         \
     __typeof__(y) _y   = (y);         \
-    Assert(_y !        = 0);          \
+    Assert(_y         != 0);          \
     __typeof__(x) _tmp = _x + _y - 1; \
     _tmp - _tmp % _y;                 \
 })