diff --git a/source/flash.css b/source/flash.css
index c506b0b..6e181b3 100644
--- a/source/flash.css
+++ b/source/flash.css
@@ -13,6 +13,11 @@
 	25%, 75% {opacity: 0;}
 }
 
+@-o-keyframes flash {
+	0%, 50%, 100% {opacity: 1;}	
+	25%, 75% {opacity: 0;}
+}
+
 @keyframes flash {
 	0%, 50%, 100% {opacity: 1;}	
 	25%, 75% {opacity: 0;}
@@ -22,5 +27,6 @@
 	-webkit-animation-name: flash;
 	-moz-animation-name: flash;
 	-ms-animation-name: flash;
+	-o-animation-name: flash;
 	animation-name: flash;
 }
\ No newline at end of file