diff --git a/usr.sbin/ctm/ctm/ctm.h b/usr.sbin/ctm/ctm/ctm.h
index b4ed57a8b3fd..5ab558de68e1 100644
--- a/usr.sbin/ctm/ctm/ctm.h
+++ b/usr.sbin/ctm/ctm/ctm.h
@@ -26,7 +26,7 @@
 #include <sys/time.h>
 
 #define VERSION "2.0"
-#define MAXSIZE (1024*1024*20)
+#define MAXSIZE (1024*1024*40)
 
 #define SUBSUFF ".ctm"
 #define TMPSUFF ".ctmtmp"