diff --git a/components/auto-complete/style/index.less b/components/auto-complete/style/index.less
index b3f2e35781..d29b657c68 100644
--- a/components/auto-complete/style/index.less
+++ b/components/auto-complete/style/index.less
@@ -47,6 +47,7 @@
       background: transparent;
       border-width: @border-width-base;
       line-height: @line-height-base;
+      height: @input-height-base;
       &:focus,
       &:hover {
         .hover;