diff --git a/tests/05-compile-tools/Makefile b/tests/05-compile-tools/Makefile
index 504cbcf9f..b5217c7be 100644
--- a/tests/05-compile-tools/Makefile
+++ b/tests/05-compile-tools/Makefile
@@ -34,14 +34,16 @@ all: clean summary
 tools.testlog:
 	@echo -n Building tool: $(basename $@)
 	@printf "%-32s" "$@" > $@
-	@$(MAKE) -C $(TOOLSDIR)  > /dev/null && \
+	@$(MAKE) -C $(TOOLSDIR) clean > /dev/null && \
+		$(MAKE) -C $(TOOLSDIR) > /dev/null && \
 		(echo " -> OK" && echo "TEST OK" >> $@) || \
 		(echo " -> FAIL" && echo "TEST FAIL" >> $@)
 
 %.testlog:
 	@echo -n Building tool: $(basename $@)
 	@printf "%-32s" "$@" > $@
-	@$(MAKE) -C $(TOOLSDIR)/$(basename $@) > /dev/null && \
+	@$(MAKE) -C $(TOOLSDIR)/$(basename $@) clean > /dev/null && \
+	  $(MAKE) -C $(TOOLSDIR)/$(basename $@) > /dev/null && \
 		(echo " -> OK" && echo "TEST OK" >> $@) || \
 		(echo " -> FAIL" && echo "TEST FAIL" >> $@)
 
diff --git a/tools/Makefile b/tools/Makefile
index 297346665..9bd1f19b1 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -3,6 +3,8 @@ all: tunslip6
 CFLAGS += -Wall -Werror
 
 tunslip6: tools-utils.c tunslip6.c
+clean:
+	rm -f *.o tunslip6
 
 gitclean:
 	@git clean -d -x -n ..
diff --git a/tools/sky/Makefile b/tools/sky/Makefile
index 334461c0a..2c4254a71 100644
--- a/tools/sky/Makefile
+++ b/tools/sky/Makefile
@@ -25,3 +25,6 @@ CFLAGS += -Wall -Werror
 
 $(SERIALDUMP):	serialdump.c
 	$(CC) -O2 -o $@ $<
+
+clean:
+	rm -f $(SERIALDUMP)