diff --git a/.gitlab/ci.sh b/.gitlab/ci.sh
index 719f515485c755799bcf9bfcff7725788f9aa4ca..f2c8c3c000ce2c24dc46c25ab1c3c39fdfb764e1 100755
--- a/.gitlab/ci.sh
+++ b/.gitlab/ci.sh
@@ -210,7 +210,7 @@ function set_toolchain_paths() {
           *) fail "unknown NIX_SYSTEM" ;;
         esac
         info "Building toolchain for $NIX_SYSTEM"
-        nix-build .gitlab/darwin/toolchain.nix --argstr system "$NIX_SYSTEM" -o toolchain.sh
+        nix-build -v0 .gitlab/darwin/toolchain.nix --argstr system "$NIX_SYSTEM" -o toolchain.sh
         cat toolchain.sh
       fi
       source toolchain.sh