diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 85794f6..5b42d0e 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -23,7 +23,15 @@ jobs:
 
       steps:
 
-        - uses: "actions/checkout@v4"
+        - name: "Checkout PR"
+          uses: "actions/checkout@v4"
+          if: github.event_name == 'pull_request_target'
+          with:
+            ref: refs/pull/${{ github.event.pull_request.number }}/merge
+
+        - name: "Checkout Branch"
+          uses: "actions/checkout@v4"
+          if: github.event_name == 'push'
 
         - name: "Set up Python ${{ matrix.python-version }}"
           uses: "actions/setup-python@v5"
diff --git a/Makefile b/Makefile
index eb12d9f..f34c2e0 100644
--- a/Makefile
+++ b/Makefile
@@ -21,3 +21,6 @@ upload:
 check:
 	ruff format --check
 	ruff check
+
+reformat:
+	ruff format
diff --git a/src/pyswip/core.py b/src/pyswip/core.py
index ace53df..aa364cd 100644
--- a/src/pyswip/core.py
+++ b/src/pyswip/core.py
@@ -39,13 +39,11 @@
 
 
 class PySwipError(Exception):
-
     def __init__(self, message):
         super().__init__(message)
 
 
 class SwiPrologNotFoundError(PySwipError):
-
     def __init__(self, message="SWI-Prolog not found"):
         super().__init__(message)
 
@@ -188,7 +186,9 @@ def _find_swipl_windows():
         # libswipl.dll must be in SWI_DIR/bin
         libswipl_path = os.path.join(swi_dir, "bin", libswipl)
         if not os.path.exists(libswipl_path):
-            raise SwiPrologNotFoundError(f"could not locate {libswipl} at {libswipl_path}")
+            raise SwiPrologNotFoundError(
+                f"could not locate {libswipl} at {libswipl_path}"
+            )
         return libswipl_path, swi_dir
 
     raise SwiPrologNotFoundError
diff --git a/tests/test_prolog.py b/tests/test_prolog.py
index f938157..59fff35 100644
--- a/tests/test_prolog.py
+++ b/tests/test_prolog.py
@@ -25,6 +25,7 @@
 """
 Tests the Prolog class.
 """
+
 import os.path
 import unittest