diff --git a/libmpdemux/demux_mpg.c b/libmpdemux/demux_mpg.c
index 0ed7d425ef..4e21a3e074 100644
--- a/libmpdemux/demux_mpg.c
+++ b/libmpdemux/demux_mpg.c
@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <math.h>
 
 #include "config.h"
 #include "mp_msg.h"