diff --git a/testsuite/link01/Makefile b/testsuite/link01/Makefile
index dd9e8e32..a3a81de6 100644
--- a/testsuite/link01/Makefile
+++ b/testsuite/link01/Makefile
@@ -21,6 +21,7 @@ include $(RTEMS_CUSTOM)
 include $(PROJECT_ROOT)/make/leaf.cfg
 
 OBJS= $(C_O_FILES)
+CLEAN_ADDITIONS += undefined.txt
 
 all:    ${ARCH} $(PGM)