diff --git a/scss/_progress.scss b/scss/_progress.scss
index 6d28c4a143..a93a634267 100644
--- a/scss/_progress.scss
+++ b/scss/_progress.scss
@@ -31,7 +31,7 @@
   @include border-radius($border-radius);
   @include box-shadow(inset 0 .1rem .1rem rgba(0,0,0,.1));
 }
-.progress[value]::-webkit-progress-value:::before {
+.progress[value]::-webkit-progress-value::before {
   content: attr(value);
 }
 .progress[value]::-webkit-progress-value {