diff --git a/packages/theme-chalk/src/form.scss b/packages/theme-chalk/src/form.scss
index 641c4ad91c..aae9f1fe53 100644
--- a/packages/theme-chalk/src/form.scss
+++ b/packages/theme-chalk/src/form.scss
@@ -107,6 +107,7 @@
     line-height: 40px;
     position: relative;
     font-size: 14px;
+    min-width: 0;
 
     .#{$namespace}-input-group {
       vertical-align: top;