diff --git a/styles/issueish-detail-view.less b/styles/issueish-detail-view.less
index 89781361f1..704b4de843 100644
--- a/styles/issueish-detail-view.less
+++ b/styles/issueish-detail-view.less
@@ -156,6 +156,7 @@
     font-weight: 600;
     color: mix(@text-color, @app-background-color, 75%);
     cursor: default;
+    user-select: none;
   }
 
   &-tab-icon {