diff --git a/build/minify.js b/build/minify.js
index 29e355d33..3dfcaac45 100755
--- a/build/minify.js
+++ b/build/minify.js
@@ -25,7 +25,6 @@
   /** Closure Compiler command-line options */
   var closureOptions = [
     '--compilation_level=ADVANCED_OPTIMIZATIONS',
-    '--language_in=ECMASCRIPT5_STRICT',
     '--warning_level=QUIET'
   ];