--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -450,18 +450,20 @@ private:
     mMessages[4] = ::RegisterWindowMessage(L"ProgrammabilityCaretVisibility");
     mMessages[5] = ::RegisterWindowMessage(L"CaretTrackingUpdateIPHidden");
     mMessages[6] = ::RegisterWindowMessage(L"CaretTrackingUpdateIPInfo");
 
     mHook = ::SetWindowsHookEx(WH_GETMESSAGE, &TIPHook, nullptr,
                                ::GetCurrentThreadId());
     MOZ_ASSERT(mHook);
 
-    if (!IsWin10OrLater() && !sProcessCaretEventsStub) {
-      // tiptsf loads when STA COM is first initialized, so it should be present
+    // On touchscreen devices, tiptsf.dll will have been loaded when STA COM was
+    // first initialized.
+    if (!IsWin10OrLater() && GetModuleHandle(L"tiptsf.dll") &&
+        !sProcessCaretEventsStub) {
       sTipTsfInterceptor.Init("tiptsf.dll");
       DebugOnly<bool> ok = sTipTsfInterceptor.AddHook("ProcessCaretEvents",
           reinterpret_cast<intptr_t>(&ProcessCaretEventsHook),
           (void**) &sProcessCaretEventsStub);
       MOZ_ASSERT(ok);
     }
 
     if (!sSendMessageTimeoutWStub) {