diff --git a/Dockerfile b/Dockerfile
index 057331f..f38ddf4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -44,9 +44,8 @@ ENV PATH=/home/rust/.cargo/bin:/usr/local/musl/bin:/usr/local/bin:/usr/bin:/bin
 # `--target` to musl so that our users don't need to keep overriding it
 # manually.
 RUN curl https://sh.rustup.rs -sSf | \
-    sh -s -- -y \
-             --default-toolchain $TOOLCHAIN \
-             --default-target x86_64-unknown-linux-musl
+    sh -s -- -y --default-toolchain $TOOLCHAIN \
+    rustup target add x86_64-unknown-linux-musl
 ADD cargo-config.toml /home/rust/.cargo/config
 
 # We'll build our libraries in subdirectories of /home/rust/libs.  Please