diff --git a/scss/_button-group.scss b/scss/_button-group.scss
index 716cf5208a9fbadd7cf60745ebce5bcdfb2f883e..d7220029ad180bf28266b90ad95445b0f57f610e 100644
--- a/scss/_button-group.scss
+++ b/scss/_button-group.scss
@@ -9,7 +9,7 @@
 
   > .btn {
     position: relative;
-    flex: 0 1 auto;
+    flex: 1 1 auto;
 
     // Bring the hover, focused, and "active" buttons to the front to overlay
     // the borders properly