diff --git a/Dockerfile b/Dockerfile
index 99f5d52..ef9ad7c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,17 +8,6 @@ ARG STEEMD_REV=master
 ARG SECP256K1_REPO=https://github.com/bitcoin/secp256k1
 ARG SECP256K1_REV=master
 
-ARG UBUNTU_MIRROR=mirror://mirrors.ubuntu.com/mirrors.txt
-
-RUN sed -i \
-    -e s#http://archive.ubuntu.com/ubuntu/#${UBUNTU_MIRROR}#g \
-    -e s#http://security.ubuntu.com/ubuntu/#${UBUNTU_MIRROR}#g \
-        /etc/apt/sources.list ; \
-        grep -v deb-src /etc/apt/sources.list > \
-            /etc/apt/sources.list.new && \
-        mv /etc/apt/sources.list.new /etc/apt/sources.list && \
-        cat /etc/apt/sources.list
-
 RUN \
     apt-get update && \
     apt-get install -y \
diff --git a/Makefile b/Makefile
index 05c44bb..c12ac45 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,3 @@
-BUILD_ARGS := --build-arg UBUNTU_MIRROR="mirror://mirrors.ubuntu.com/mirrors.txt"
-ifdef UBUNTU_MIRROR
-	BUILD_ARGS := --build-arg UBUNTU_MIRROR="$(UBUNTU_MIRROR)"
-endif
-
 default: build
 
 build: kill