diff --git a/Makefile b/Makefile
index bddd9e4..4f584b1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,7 @@
 DIST := dist
 GO ?= go
+SED_INPLACE := sed -i
+SHASUM ?= shasum -a 256
 
 ifneq ($(DRONE_TAG),)
 	VERSION ?= $(subst v,,$(DRONE_TAG))