diff --git a/tests/functional/ca/nix-run.sh b/tests/functional/ca/nix-run.sh
index 5f46518e8..920950c11 100755
--- a/tests/functional/ca/nix-run.sh
+++ b/tests/functional/ca/nix-run.sh
@@ -4,4 +4,4 @@ source common.sh
 
 FLAKE_PATH=path:$PWD
 
-nix run --no-write-lock-file $FLAKE_PATH#runnable
+nix run --no-write-lock-file "$FLAKE_PATH#runnable"