diff --git a/whalesong/js-assembler/runtime-src/hashes-header.js b/whalesong/js-assembler/runtime-src/hashes-header.js
index 04886a7..82495fe 100644
--- a/whalesong/js-assembler/runtime-src/hashes-header.js
+++ b/whalesong/js-assembler/runtime-src/hashes-header.js
@@ -1 +1,2 @@
 (function() {
+'use strict';
\ No newline at end of file
diff --git a/whalesong/js-assembler/runtime-src/js-numbers.js b/whalesong/js-assembler/runtime-src/js-numbers.js
index f8294ce..850d506 100644
--- a/whalesong/js-assembler/runtime-src/js-numbers.js
+++ b/whalesong/js-assembler/runtime-src/js-numbers.js
@@ -36,6 +36,7 @@ if (typeof(exports) !== 'undefined') {
 
 
 (function() {
+    'use strict';
     // Abbreviation
     var Numbers = __PLTNUMBERS_TOP__;
     //var Numbers = jsnums;