1 files changed, 1 insertions, 0 deletions
diff --git a/emscripten.py b/emscripten.py
index 3bdff336..753f1c80 100755
--- a/emscripten.py
+++ b/emscripten.py
@@ -348,6 +348,7 @@ var asmPre = (function(env, buffer) {
   var HEAPF64 = new env.Float64Array(buffer);
 ''' % (asm_setup,) + asm_globals + '''
   var __THREW__ = 0;
+  var undef = 0;
 
   function stackAlloc(size) {
     var ret = STACKTOP;