diff --git a/gfx/gl/GLContextProviderGLX.cpp b/gfx/gl/GLContextProviderGLX.cpp
index 9a1157f330cb..03df3c6d7014 100644
--- a/gfx/gl/GLContextProviderGLX.cpp
+++ b/gfx/gl/GLContextProviderGLX.cpp
@@ -823,7 +823,7 @@ GLContextGLX::CreateGLContext(CreateContextFlags flags, const SurfaceCaps& caps,
     RefPtr<GLContextGLX> glContext;
     bool error;
 
-    OffMainThreadScopedXErrorHandler xErrorHandler;
+    ScopedXErrorHandler xErrorHandler;
 
     do {
         error = false;
@@ -1311,7 +1311,7 @@ CreateOffscreenPixmapContext(CreateContextFlags flags, const IntSize& size,
     int depth;
     FindVisualAndDepth(display, visid, &visual, &depth);
 
-    OffMainThreadScopedXErrorHandler xErrorHandler;
+    ScopedXErrorHandler xErrorHandler;
     bool error = false;
 
     Drawable drawable;
diff --git a/gfx/src/X11Util.cpp b/gfx/src/X11Util.cpp
index 7dd02d2fd7a8..e1492be54511 100644
--- a/gfx/src/X11Util.cpp
+++ b/gfx/src/X11Util.cpp
@@ -57,15 +57,13 @@ ScopedXErrorHandler::ErrorHandler(Display *, XErrorEvent *ev)
     return 0;
 }
 
-ScopedXErrorHandler::ScopedXErrorHandler(bool aAllowOffMainThread)
+ScopedXErrorHandler::ScopedXErrorHandler()
 {
-    if (!aAllowOffMainThread) {
-      // Off main thread usage is not safe in general, but OMTC GL layers uses this
-      // with the main thread blocked, which makes it safe.
-      NS_WARNING_ASSERTION(
+    // Off main thread usage is not safe in general, but OMTC GL layers uses this
+    // with the main thread blocked, which makes it safe.
+    NS_WARNING_ASSERTION(
         NS_IsMainThread(),
         "ScopedXErrorHandler being called off main thread, may cause issues");
-    }
     // let sXErrorPtr point to this object's mXError object, but don't reset this mXError object!
     // think of the case of nested ScopedXErrorHandler's.
     mOldXErrorPtr = sXErrorPtr;
diff --git a/gfx/src/X11Util.h b/gfx/src/X11Util.h
index 83944d5c053c..dff855ff23f9 100644
--- a/gfx/src/X11Util.h
+++ b/gfx/src/X11Util.h
@@ -118,10 +118,7 @@ public:
     static int
     ErrorHandler(Display *, XErrorEvent *ev);
 
-    /**
-     * @param aAllowOffMainThread whether to warn if used off main thread
-     */
-    ScopedXErrorHandler(bool aAllowOffMainThread = false);
+    ScopedXErrorHandler();
 
     ~ScopedXErrorHandler();
 
@@ -134,15 +131,6 @@ public:
     bool SyncAndGetError(Display *dpy, XErrorEvent *ev = nullptr);
 };
 
-class OffMainThreadScopedXErrorHandler : public ScopedXErrorHandler
-{
-public:
-  OffMainThreadScopedXErrorHandler()
-    : ScopedXErrorHandler(true)
-  {
-  }
-};
-
 } // namespace mozilla
 
 #endif  // mozilla_X11Util_h