diff --git a/src/field/index.less b/src/field/index.less
index 6a250d4ab..e3df3bd21 100644
--- a/src/field/index.less
+++ b/src/field/index.less
@@ -23,6 +23,7 @@
     display: block;
     box-sizing: border-box;
     width: 100%;
+    min-width: 0; // for flex-shrink in field__button
     margin: 0;
     padding: 0;
     color: @field-input-text-color;