diff --git a/tap-rtp-common.c b/tap-rtp-common.c
index 76e8163583..523518fc8c 100644
--- a/tap-rtp-common.c
+++ b/tap-rtp-common.c
@@ -33,6 +33,7 @@
 # include "config.h"
 #endif
 
+#include <math.h>
 #include "globals.h"
 
 #include <epan/tap.h>