diff --git a/Makefile b/Makefile
index 0fac253..d7e2d37 100644
--- a/Makefile
+++ b/Makefile
@@ -30,10 +30,15 @@ checkblack:
 checkeditorconfig:
 	editorconfig-checker
 
+# The uv env resolves *upstream* lnbits from PyPI, which lacks the aio fork's
+# modules (lnbits.core.signers, …). Point PYTHONPATH at a fork checkout so
+# `import lnbits` picks it up; override with LNBITS_SRC=/path/to/lnbits.
+LNBITS_SRC ?= $(HOME)/dev/lnbits/dev
 test:
+	PYTHONPATH=$(LNBITS_SRC) \
 	PYTHONUNBUFFERED=1 \
 	DEBUG=true \
-	uv run pytest
+	uv run --frozen pytest
 install-pre-commit-hook:
 	@echo "Installing pre-commit hook to git"
 	@echo "Uninstall the hook with uv run pre-commit uninstall"