diff --git a/docs/assets/css/bootstrap.css b/docs/assets/css/bootstrap.css
index b1417228ef..794156e27b 100644
--- a/docs/assets/css/bootstrap.css
+++ b/docs/assets/css/bootstrap.css
@@ -3747,6 +3747,8 @@ a.badge:hover {
 .progress.active .bar {
   -webkit-animation: progress-bar-stripes 2s linear infinite;
   -moz-animation: progress-bar-stripes 2s linear infinite;
+  -ms-animation: progress-bar-stripes 2s linear infinite;
+  -o-animation: progress-bar-stripes 2s linear infinite;
   animation: progress-bar-stripes 2s linear infinite;
 }
 .progress-danger .bar {
diff --git a/less/progress-bars.less b/less/progress-bars.less
index 3da1f6f176..3b47e64828 100644
--- a/less/progress-bars.less
+++ b/less/progress-bars.less
@@ -23,6 +23,12 @@
   to    { background-position: 0 0; }
 }
 
+// Opera
+@-o-keyframes progress-bar-stripes {
+  from  { background-position: 0 0; }
+  to    { background-position: 40px 0; }
+}
+
 // Spec
 @keyframes progress-bar-stripes {
   from  { background-position: 40px 0; }
@@ -68,6 +74,8 @@
 .progress.active .bar {
   -webkit-animation: progress-bar-stripes 2s linear infinite;
      -moz-animation: progress-bar-stripes 2s linear infinite;
+      -ms-animation: progress-bar-stripes 2s linear infinite;
+       -o-animation: progress-bar-stripes 2s linear infinite;
           animation: progress-bar-stripes 2s linear infinite;
 }