diff --git a/tools/testing/selftests/resctrl/Makefile b/tools/testing/selftests/resctrl/Makefile
index bee5fa8f1ac9..9cc7e0108c8b 100644
--- a/tools/testing/selftests/resctrl/Makefile
+++ b/tools/testing/selftests/resctrl/Makefile
@@ -5,4 +5,4 @@ TEST_GEN_PROGS := resctrl_tests
 
 include ../lib.mk
 
-$(OUTPUT)/resctrl_tests: $(wildcard *.c)
+$(OUTPUT)/resctrl_tests: $(wildcard *.[ch])