diff --git a/libavcodec/audioconvert.c b/libavcodec/audioconvert.c
index 91ea7abdc4..8410d29489 100644
--- a/libavcodec/audioconvert.c
+++ b/libavcodec/audioconvert.c
@@ -79,7 +79,7 @@ static const char* const channel_names[]={
     [30] = "DR",
 };
 
-const char *get_channel_name(int channel_id)
+static const char *get_channel_name(int channel_id)
 {
     if (channel_id<0 || channel_id>=FF_ARRAY_ELEMS(channel_names))
         return NULL;