diff --git a/Makefile b/Makefile
index 44a34d3..8bdae9c 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,6 @@
 
 EXECUTABLE ?= drone-s3-sync
 IMAGE ?= plugins/$(EXECUTABLE)
-CI_BUILD_NUMBER ?= 0
 
 LDFLAGS = -X "main.buildDate=$(shell date -u '+%Y-%m-%d %H:%M:%S %Z')"
 PACKAGES = $(shell go list ./... | grep -v /vendor/)