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-rw-r--r--src/var/indexOf.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/var/indexOf.js b/src/var/indexOf.js
index 5283841b2..8320b98e5 100644
--- a/src/var/indexOf.js
+++ b/src/var/indexOf.js
@@ -1,5 +1,7 @@
define( [
"./arr"
], function( arr ) {
+ "use strict";
+
return arr.indexOf;
} );