diff --git a/lib/web3/ipcprovider.js b/lib/web3/ipcprovider.js
index a580e02..adc09f1 100644
--- a/lib/web3/ipcprovider.js
+++ b/lib/web3/ipcprovider.js
@@ -99,8 +99,8 @@ Timeout all requests when the end/error event is fired
 @method _timeout
 */
 IpcProvider.prototype._timeout = function() {
-    for(key in this.responseCallbacks) {
-        if(this.responseCallback.hasOwnProperty(key)){
+    for(var key in this.responseCallbacks) {
+        if(this.responseCallbacks.hasOwnProperty(key)){
             this.responseCallbacks[key](errorTimeout.replace('__id__', key).replace('__method__', this.responseCallbacks[key].method));
         }
     }