--- a/.docker/Dockerfile-collators
+++ b/.docker/Dockerfile-collators
@@ -28,6 +28,8 @@
 ARG POLKADOT_LAUNCH_BRANCH
 ARG BRANCH
 
+ENV POLKADOT_LAUNCH_BRANCH $POLKADOT_LAUNCH_BRANCH
+
 WORKDIR /unique_parachain
 
 RUN git clone -b $BRANCH https://github.com/UniqueNetwork/unique-chain.git && \
@@ -46,7 +48,7 @@
       nvm install v16.16.0 && \
       nvm use v16.16.0
 
-RUN git clone https://github.com/uniquenetwork/polkadot-launch -b $POLKADOT_LAUNCH_BRANCH
+RUN git clone https://github.com/uniquenetwork/polkadot-launch -b ${POLKADOT_LAUNCH_BRANCH}
 
 RUN export NVM_DIR="$HOME/.nvm" && \
     [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" && \