diff --git a/ffmpeg.c b/ffmpeg.c
index d8396dc1f9..c6297a1a1c 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -918,7 +918,7 @@ static int configure_audio_filters(FilterGraph *fg, AVFilterContext **in_filter,
     if (audio_volume != 256) {
         char args[256];
 
-        snprintf(args, sizeof(args), "%lf", audio_volume / 256.);
+        snprintf(args, sizeof(args), "%f", audio_volume / 256.);
         AUTO_INSERT_FILTER("-vol", "volume", args);
     }