diff --git a/audio/decode/dec_audio.c b/audio/decode/dec_audio.c
index 98fb83f895..03172ed294 100644
--- a/audio/decode/dec_audio.c
+++ b/audio/decode/dec_audio.c
@@ -18,6 +18,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <math.h>
 #include <assert.h>
 
 #include <libavutil/mem.h>