diff --git a/Makefile b/Makefile
index f939f259..63ce45e1 100644
--- a/Makefile
+++ b/Makefile
@@ -3,8 +3,8 @@
 BUILD_WITHOUT_QUIC ?= true
 export BUILD_WITHOUT_QUIC
 
-REBAR = $(or $(shell which rebar3 2>/dev/null),$(CURDIR)/rebar3)
-REBAR_VERSION = 3.19.0-emqx-1
+REBAR ?= $(or $(shell which rebar3 2>/dev/null),$(CURDIR)/rebar3)
+REBAR_VERSION ?= 3.19.0-emqx-1
 
 .PHONY: all
 all: compile