diff --git a/c/src/tests/libtests/Makefile.in b/c/src/tests/libtests/Makefile.in
index c75dcfade7..c6875734a0 100644
--- a/c/src/tests/libtests/Makefile.in
+++ b/c/src/tests/libtests/Makefile.in
@@ -10,4 +10,4 @@ VPATH=@srcdir@
 include $(RTEMS_CUSTOM)
 include $(PROJECT_ROOT)/make/directory.cfg
 
-SUB_DIRS=malloctest stackchk
+SUB_DIRS=cpuuse rtmonuse malloctest stackchk