diff --git a/tools/perf/tests/make b/tools/perf/tests/make
index d1efef9c7576fbbe3ed9911ed46341539baf2209..dbbb62c0d0f33737e525bea391d2f03f2b07e4a8 100644
--- a/tools/perf/tests/make
+++ b/tools/perf/tests/make
@@ -102,7 +102,7 @@ test_make_util_map_o_O := true
 test_default = test -x $(PERF)/perf
 test = $(if $(test_$1),$(test_$1),$(test_default))
 
-test_default_O = test -x $$TMP/perf
+test_default_O = test -x $$TMP_O/perf
 test_O = $(if $(test_$1),$(test_$1),$(test_default_O))
 
 all:
@@ -127,14 +127,14 @@ $(run):
 
 $(run_O):
 	$(call clean)
-	@TMP=$$(mktemp -d); \
-	cmd="cd $(PERF) && make -f $(MK) $($(patsubst %_O,%,$@)) O=$$TMP"; \
+	@TMP_O=$$(mktemp -d); \
+	cmd="cd $(PERF) && make -f $(MK) $($(patsubst %_O,%,$@)) O=$$TMP_O"; \
 	echo "- $@: $$cmd" && echo $$cmd > $@ && \
 	( eval $$cmd ) >> $@ 2>&1 && \
 	echo "  test: $(call test_O,$@)"; \
 	$(call test_O,$@) && \
 	rm -f $@ && \
-	rm -rf $$TMP
+	rm -rf $$TMP_O
 
 all: $(run) $(run_O)
 	@echo OK