diff --git a/Makefile b/Makefile
index 096d582a7..7d75804cd 100644
--- a/Makefile
+++ b/Makefile
@@ -385,7 +385,7 @@ ccan/ccan/cdump/tools/cdump-enumstr.o: $(CCAN_HEADERS) Makefile
 
 gen_version.h: FORCE
 	@(echo "#define VERSION \"$(VERSION)\"" && echo "#define BUILD_FEATURES \"$(FEATURES)\"") > $@.new
-	@if cmp $@.new $@ >/dev/null 2>&2; then rm -f $@.new; else mv $@.new $@; echo Version updated; fi
+	@if cmp $@.new $@ >/dev/null 2>&1; then rm -f $@.new; else mv $@.new $@; echo Version updated; fi
 
 # That forces this rule to be run every time, too.
 gen_header_versions.h: tools/headerversions