diff --git a/src/col/index.less b/src/col/index.less
index 35fa2f4f5..ce2f6bd9b 100644
--- a/src/col/index.less
+++ b/src/col/index.less
@@ -9,11 +9,11 @@
 .generate-col(24);
 .generate-col(@n, @i: 1) when (@i =< @n) {
   .van-col--@{i} {
-    width: @i * 100% / 24;
+    width: (@i * 100% / 24);
   }
 
   .van-col--offset-@{i} {
-    margin-left: @i * 100% / 24;
+    margin-left: (@i * 100% / 24);
   }
 
   .generate-col(@n, (@i + 1));