diff --git a/dom/workers/test/gtest/TestReadWrite.cpp b/dom/workers/test/gtest/TestReadWrite.cpp
index 9955dec89527..bf85a6031ea2 100644
--- a/dom/workers/test/gtest/TestReadWrite.cpp
+++ b/dom/workers/test/gtest/TestReadWrite.cpp
@@ -248,7 +248,7 @@ TEST(ServiceWorkerRegistrar, TestWriteData)
     const mozilla::ipc::ContentPrincipalInfo& cInfo = data[i].principal();
 
     ASSERT_EQ((uint32_t)i, cInfo.appId());
-    ASSERT_EQ((uint32_t)(i %2), cInfo.isInBrowserElement());
+    ASSERT_EQ((uint32_t)(i % 2), (uint32_t)cInfo.isInBrowserElement());
 
     test.AppendPrintf("spec write %d", i);
     ASSERT_STREQ(test.get(), cInfo.spec().get());
diff --git a/dom/workers/test/gtest/moz.build b/dom/workers/test/gtest/moz.build
index f4386bb40b10..6be8377e9f29 100644
--- a/dom/workers/test/gtest/moz.build
+++ b/dom/workers/test/gtest/moz.build
@@ -10,7 +10,4 @@ UNIFIED_SOURCES = [
 
 include('/ipc/chromium/chromium-config.mozbuild')
 
-# XXX: We should fix these warnings.
-ALLOW_COMPILER_WARNINGS = True
-
 FINAL_LIBRARY = 'xul-gtest'