diff --git a/platform/chromium/vapi-background.js b/platform/chromium/vapi-background.js
index 181ffea..b63fa19 100644
--- a/platform/chromium/vapi-background.js
+++ b/platform/chromium/vapi-background.js
@@ -229,7 +229,7 @@ vAPI.tabs.injectScript = function(tabId, details, callback) {
         }
     };
     if ( tabId ) {
-        tabid = parseInt(tabId, 10);
+        tabId = parseInt(tabId, 10);
         chrome.tabs.executeScript(tabId, details, onScriptExecuted);
     } else {
         chrome.tabs.executeScript(details, onScriptExecuted);