diff --git a/freebsd/Platform.c b/freebsd/Platform.c
index 9e0c25b0..f02daa5a 100644
--- a/freebsd/Platform.c
+++ b/freebsd/Platform.c
@@ -24,6 +24,7 @@ in the source distribution for its full text.
 #include <sys/resource.h>
 #include <vm/vm_param.h>
 #include <time.h>
+#include <math.h>
 
 /*{
 #include "Action.h"