diff --git a/www/firefox-esr/files/patch-dom_media_flac_FlacDecoder.cpp b/www/firefox-esr/files/patch-dom_media_flac_FlacDecoder.cpp
index 954b78f5bf37..6dc197d9455e 100644
--- a/www/firefox-esr/files/patch-dom_media_flac_FlacDecoder.cpp
+++ b/www/firefox-esr/files/patch-dom_media_flac_FlacDecoder.cpp
@@ -1,23 +1,23 @@
 Enable FLAC on platforms without ffvpx like powerpc*
 
 --- dom/media/flac/FlacDecoder.cpp.orig	2021-04-15 19:44:28 UTC
 +++ dom/media/flac/FlacDecoder.cpp
 @@ -7,6 +7,7 @@
  #include "FlacDecoder.h"
  #include "MediaContainerType.h"
  #include "mozilla/StaticPrefs_media.h"
 +#include "PDMFactory.h"
  
  namespace mozilla {
  
 @@ -14,6 +15,10 @@ namespace mozilla {
  bool FlacDecoder::IsEnabled() {
  #ifdef MOZ_FFVPX
    return StaticPrefs::media_flac_enabled();
 +#elif defined(MOZ_FFMPEG)
 +  RefPtr<PDMFactory> platform = new PDMFactory();
 +  return StaticPrefs::media_flac_enabled() &&
-+         platform->SupportsMimeType("audio/flac"_ns);
++         !platform->SupportsMimeType("audio/flac"_ns).isEmpty();
  #else
    return false;
  #endif