diff --git a/glue.rs b/glue.rs
index 275a50551..06a317863 100644
--- a/glue.rs
+++ b/glue.rs
@@ -175,4 +175,5 @@ pub fn GetProxyHandlerExtra(obj: *JSObject) -> *libc::c_void;
 pub fn GetProxyHandler(obj: *JSObject) -> *libc::c_void;
 pub fn InvokeGetOwnPropertyDescriptor(handler: *libc::c_void, cx: *JSContext, proxy: *JSObject, id: jsid, set: JSBool, desc: *mut JSPropertyDescriptor) -> JSBool;
 pub fn GetGlobalForObjectCrossCompartment(obj: *JSObject) -> *JSObject;
+pub fn ReportError(cx: *JSContext, error: *c_char);
 }
diff --git a/jsglue.cpp b/jsglue.cpp
index b9d9b3bae..b27624a16 100644
--- a/jsglue.cpp
+++ b/jsglue.cpp
@@ -622,4 +622,15 @@ GetGlobalForObjectCrossCompartment(JSObject* obj)
     return js::GetGlobalForObjectCrossCompartment(obj);
 }
 
+void
+ReportError(JSContext* aCx, const char* aError)
+{
+#ifdef DEBUG
+    for (const char* p = aError; *p; ++p) {
+        assert(*p != '%');
+    }
+#endif
+    JS_ReportError(aCx, aError);
+}
+
 } // extern "C"