diff --git a/src/shell-recorder.c b/src/shell-recorder.c
index 8c1fb3f2b..a129f7d7b 100644
--- a/src/shell-recorder.c
+++ b/src/shell-recorder.c
@@ -3,6 +3,7 @@
 #include "config.h"
 
 #include <fcntl.h>
+#include <math.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>