diff --git a/pkgs/development/libraries/qt-5/modules/qtwebengine.nix b/pkgs/development/libraries/qt-5/modules/qtwebengine.nix
index 68f3772a9976..1a63c9508c05 100644
--- a/pkgs/development/libraries/qt-5/modules/qtwebengine.nix
+++ b/pkgs/development/libraries/qt-5/modules/qtwebengine.nix
@@ -173,6 +173,10 @@ qtModule ({
     # ld: fatal warning(s) induced error (-fatal_warnings)
     substituteInPlace src/3rdparty/chromium/build/config/compiler/BUILD.gn \
       --replace "-Wl,-fatal_warnings" ""
+
+    # Use system ffmpeg
+    echo "gn_args += use_system_ffmpeg=true" >> src/core/config/mac_osx.pri
+    echo "LIBS += -lavformat -lavcodec -lavutil" >> src/core/core_common.pri
   '') + postPatch;
 
   env = {