diff --git a/tests/nix-profile.sh b/tests/nix-profile.sh
index 652e8a8f2..4ef5b484a 100644
--- a/tests/nix-profile.sh
+++ b/tests/nix-profile.sh
@@ -144,6 +144,7 @@ expect 1 nix profile install $flake2Dir
 diff -u <(
     nix --offline profile install $flake2Dir 2>&1 1> /dev/null \
         | grep -vE "^warning: " \
+        | grep -vE "^error \(ignored\): " \
         || true
 ) <(cat << EOF
 error: An existing package already provides the following file: