diff --git a/tests/functional/flakes/flakes.sh b/tests/functional/flakes/flakes.sh
index 6c466a0c7cb5..acbd32a91f31 100755
--- a/tests/functional/flakes/flakes.sh
+++ b/tests/functional/flakes/flakes.sh
@@ -106,6 +106,14 @@ nix build -o "$TEST_ROOT/result" "git+file://$flake1Dir#default"
 nix build -o "$TEST_ROOT/result" "$flake1Dir?ref=HEAD#default"
 nix build -o "$TEST_ROOT/result" "git+file://$flake1Dir?ref=HEAD#default"
 
+# Check that relative paths are allowed for git flakes.
+# This may change in the future once git submodule support is refined.
+# See: https://discourse.nixos.org/t/57783 and #9708.
+(
+  cd "$flake1Dir/.."
+  nix build -o "$TEST_ROOT/result" "git+file:./$(basename "$flake1Dir")"
+)
+
 # Check that store symlinks inside a flake are not interpreted as flakes.
 nix build -o "$flake1Dir/result" "git+file://$flake1Dir"
 nix path-info "$flake1Dir/result"