diff --git a/testcode/lib/files.txt b/testcode/lib/files.txt
index 733daf740..b5195609a 100644
--- a/testcode/lib/files.txt
+++ b/testcode/lib/files.txt
@@ -11,3 +11,4 @@ cprintf.c	-	test program for cprintf \n and \r operators
 
 deb.c		-	test program for the library debugger
 
+clock.c		-	test program for clock() and CLOCKS_PER_SEC