diff --git a/src/webview/webkitgtk/mod.rs b/src/webview/webkitgtk/mod.rs
index cf49acc35..1fc042c72 100644
--- a/src/webview/webkitgtk/mod.rs
+++ b/src/webview/webkitgtk/mod.rs
@@ -335,7 +335,11 @@ impl InnerWebView {
     };
 
     // Initialize message handler
-    w.init("Object.defineProperty(window, 'ipc', { value: Object.freeze({ postMessage: function(x) { window.webkit.messageHandlers['ipc'].postMessage(x) } }) })")?;
+    let mut init = String::with_capacity(115 + 20 + 22);
+    init.push_str("Object.defineProperty(window, 'ipc', {value: Object.freeze({postMessage:function(x){window.webkit.messageHandlers[\"");
+    init.push_str(&window_hash);
+    init.push_str("\"].postMessage(x)}})})");
+    w.init(&init)?;
 
     // Initialize scripts
     for js in attributes.initialization_scripts {