diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 77f124f..d977656 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -62,7 +62,7 @@
 	ARCH := x86
 	IS_X86_64 := 0
 	ifeq (, $(findstring m32,$(EXTRA_CFLAGS)))
-		IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -xc - | tail -n 1)
+		IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -x c - | tail -n 1)
 	endif
 	ifeq (${IS_X86_64}, 1)
 		RAW_ARCH := x86_64