diff --git a/src/wrappers.js b/src/wrappers.js
index 28f7536..9a4db8a 100644
--- a/src/wrappers.js
+++ b/src/wrappers.js
@@ -21,6 +21,7 @@ var ShadowDOMPolyfill = {};
       var f = new Function('', 'return true;');
       hasEval = f();
     } catch (ex) {
+      hasEval = false;
     }
   }
 
@@ -370,4 +371,4 @@ var ShadowDOMPolyfill = {};
   scope.wrapIfNeeded = wrapIfNeeded;
   scope.wrappers = wrappers;
 
-})(this.ShadowDOMPolyfill);
\ No newline at end of file
+})(this.ShadowDOMPolyfill);