diff --git a/components/input/style/mixin.less b/components/input/style/mixin.less
index 56f9aaa113..4c34c1d870 100644
--- a/components/input/style/mixin.less
+++ b/components/input/style/mixin.less
@@ -107,6 +107,7 @@
   position: relative;
   display: table;
   border-collapse: separate;
+  width: 100%;
 
   // Undo padding and float of grid classes
   &[class*="col-"] {