diff --git a/notebook/static/notebook/less/outputarea.less b/notebook/static/notebook/less/outputarea.less
index 7e4d39346..f37a77b29 100644
--- a/notebook/static/notebook/less/outputarea.less
+++ b/notebook/static/notebook/less/outputarea.less
@@ -41,7 +41,7 @@ div.out_prompt_overlay:hover {
 
 div.output_prompt {
     color: @output_prompt_color;
-    min-width: 11ex;
+    min-width: 15ex;
 }
 
 /* This class is the outer container of all output sections. */