diff --git a/docker/Dockerfile.nu-base b/docker/Dockerfile.nu-base
index 1a9e83a11..81e482299 100644
--- a/docker/Dockerfile.nu-base
+++ b/docker/Dockerfile.nu-base
@@ -12,7 +12,7 @@ RUN apt-get update && apt-get install -y libssl-dev \
 ARG RELEASE=false
 WORKDIR /code
 COPY ./rust-toolchain ./rust-toolchain
-RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --no-modify-path --default-toolchain `cat rust-toolchain`
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --no-modify-path --default-toolchain "stable"
 ENV PATH=/root/.cargo/bin:$PATH
 COPY . /code
 RUN echo "##vso[task.prependpath]/root/.cargo/bin" && \