diff --git a/examples/standalone/Makefile b/examples/standalone/Makefile
index 2dacba2..0863a8c 100644
--- a/examples/standalone/Makefile
+++ b/examples/standalone/Makefile
@@ -22,7 +22,7 @@
 ELF := $(strip $(extra-y))
 
 extra-y += $(addsuffix .srec,$(extra-y)) $(addsuffix .bin,$(extra-y))
-clean-files  := $(extra-) $(addsuffix .srec,$(extra-)) $(addsuffix .bin,$(extra-))
+clean-files  := *.srec *.bin
 
 COBJS	:= $(ELF:=.o)