diff --git a/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp b/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp
index f1a329a70..173d30915 100644
--- a/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp
+++ b/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp
@@ -19,7 +19,10 @@
 #include <osgDB/FileNameUtils>
 #include <osgDB/FileUtils>
 
-#if LIBAVCODEC_VERSION_MAJOR >= 53 || (LIBAVCODEC_VERSION_MAJOR==52 && LIBAVCODEC_VERSION_MINOR>=30)
+
+#if LIBAVCODEC_VERSION_MAJOR >= 53 || \
+    (LIBAVCODEC_VERSION_MAJOR==52 && LIBAVCODEC_VERSION_MINOR>=30) || \
+    (LIBAVCODEC_VERSION_MAJOR==52 && LIBAVCODEC_VERSION_MINOR==20 && LIBAVCODEC_VERSION_MICRO >= 1)
     #define USE_AV_LOCK_MANAGER
 #endif