diff --git a/Makefile b/Makefile
index 52aa4d7..35fcb8e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,8 @@
-BUILD_VERSION ?= 1.13.1
+export BUILD_VERSION ?= 1.13.1
+export DEBIAN_FRONTEND ?= noninteractive
+export LANG ?= C.UTF-8
+export TZ ?= UTC
 DB ?= postgresql
-DEBIAN_FRONTEND ?= noninteractive
-LANG ?= C.UTF-8
-TZ ?= UTC
 SRC := src
 
 .PHONY: all
@@ -14,7 +14,7 @@ build: build-src build-bin
 .PHONY: build-src
 build-src:
 	mkdir -p $(SRC); \
-	curl -sSL https://github.com/dani-garcia/bitwarden_rs/archive/$${BUILD_VERSION##v}.tar.gz | tar xz -C $(SRC) --strip-components=1
+	curl -sSL "https://github.com/dani-garcia/bitwarden_rs/archive/$${BUILD_VERSION##v}.tar.gz" | tar xz -C $(SRC) --strip-components=1
 
 .PHONY: build-bin
 build-bin: