diff --git a/tools/perf/pmu-events/Build b/tools/perf/pmu-events/Build
index 4ebf37c14978..ee8ba74f82de 100644
--- a/tools/perf/pmu-events/Build
+++ b/tools/perf/pmu-events/Build
@@ -1,6 +1,6 @@
 pmu-events-y	+= pmu-events.o
 JDIR		=  pmu-events/arch/$(SRCARCH)
-JSON		=  $(shell find pmu-events/arch -name *.json -o -name *.csv)
+JSON		=  $(shell find pmu-events/arch -name '*.json' -o -name '*.csv')
 JDIR_TEST	=  pmu-events/arch/test
 JSON_TEST	=  $(shell [ -d $(JDIR_TEST) ] &&			\
 			find $(JDIR_TEST) -name '*.json')