diff --git a/components/select/style/index.less b/components/select/style/index.less
index 6b18ec51d7..27b3d08565 100644
--- a/components/select/style/index.less
+++ b/components/select/style/index.less
@@ -237,6 +237,7 @@
   &-search--inline {
     position: absolute;
     height: 100%;
+    width: 100%;
 
     .@{select-prefix-cls}-selection--multiple & {
       float: left;