diff --git a/extern/osg-ffmpeg-videoplayer/audiodecoder.cpp b/extern/osg-ffmpeg-videoplayer/audiodecoder.cpp
index 09de3bc447..ee6400177a 100644
--- a/extern/osg-ffmpeg-videoplayer/audiodecoder.cpp
+++ b/extern/osg-ffmpeg-videoplayer/audiodecoder.cpp
@@ -1,5 +1,6 @@
 #include "audiodecoder.hpp"
 
+#include <algorithm>
 #include <stdexcept>
 #include <string>
 
diff --git a/extern/osg-ffmpeg-videoplayer/videostate.cpp b/extern/osg-ffmpeg-videoplayer/videostate.cpp
index b7be816298..9fd209d564 100644
--- a/extern/osg-ffmpeg-videoplayer/videostate.cpp
+++ b/extern/osg-ffmpeg-videoplayer/videostate.cpp
@@ -1,5 +1,6 @@
 #include "videostate.hpp"
 
+#include <algorithm>
 #include <cassert>
 #include <iostream>