diff --git a/source/shake.css b/source/shake.css
index 61cab1e..5b614cc 100644
--- a/source/shake.css
+++ b/source/shake.css
@@ -16,6 +16,12 @@
 	20%, 40%, 60%, 80% {-ms-transform: translateX(10px);}
 }
 
+@-o-keyframes shake {
+	0%, 100% {-o-transform: translateX(0);}
+	10%, 30%, 50%, 70%, 90% {-o-transform: translateX(-10px);}
+	20%, 40%, 60%, 80% {-o-transform: translateX(10px);}
+}
+
 @keyframes shake {
 	0%, 100% {transform: translateX(0);}
 	10%, 30%, 50%, 70%, 90% {transform: translateX(-10px);}
@@ -26,5 +32,6 @@
 	-webkit-animation-name: shake;
 	-moz-animation-name: shake;
 	-ms-animation-name: shake;
+	-o-animation-name: shake;
 	animation-name: shake;
 }
\ No newline at end of file