diff --git a/app/mac/build-and-unify b/app/mac/build-and-unify
index 6cff315439..71b88a1385 100755
--- a/app/mac/build-and-unify
+++ b/app/mac/build-and-unify
@@ -27,8 +27,7 @@ export MOZ_BUILD_DATE=`date "+%Y%m%d%H%M%S"`
 
 # Install required Rust version
 rustup toolchain install $RUST_VERSION
-rustup target add aarch64-apple-darwin
-rustup target add x86_64-apple-darwin
+rustup target add --toolchain $RUST_VERSION aarch64-apple-darwin x86_64-apple-darwin
 rustup default $RUST_VERSION
 
 cp "$SCRIPT_DIR/mozconfig" "$GECKO_PATH"