diff --git a/dom/media/gmp-plugin/gmp-test-output-protection.h b/dom/media/gmp-plugin/gmp-test-output-protection.h
index 0ba726d108b0..85e9bfc4e912 100644
--- a/dom/media/gmp-plugin/gmp-test-output-protection.h
+++ b/dom/media/gmp-plugin/gmp-test-output-protection.h
@@ -11,7 +11,7 @@
 #include <vector>
 #include <windows.h>
 
-#include "Opmapi.h"
+#include "opmapi.h"
 #endif
 
 namespace mozilla {