diff --git a/openapi_python_client/config.py b/openapi_python_client/config.py
index a246b3737..ace95c6b1 100644
--- a/openapi_python_client/config.py
+++ b/openapi_python_client/config.py
@@ -37,7 +37,7 @@ class Config(BaseModel):
     @staticmethod
     def load_from_path(path: Path) -> "Config":
         """Creates a Config from provided JSON or YAML file and sets a bunch of globals from it"""
-        mime = mimetypes.guess_type(path.as_uri(), strict=True)[0]
+        mime = mimetypes.guess_type(path.absolute().as_uri(), strict=True)[0]
         if mime == "application/json":
             config_data = json.loads(path.read_text())
         else:
diff --git a/pyproject.toml b/pyproject.toml
index e136c3eb9..0bc30d05b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,7 +62,8 @@ isort .\
  && poetry export -f requirements.txt | poetry run safety check --bare --stdin\
  && mypy openapi_python_client\
  && pylint openapi_python_client\
- && pytest --cov openapi_python_client tests --cov-report=term-missing\
+ && TASKIPY=true pytest --cov openapi_python_client tests --cov-report=term-missing --basetemp=tests/tmp\
+ && rm -r tests/tmp\
 """
 regen = "python -m end_to_end_tests.regen_golden_record"
 e2e = "pytest openapi_python_client end_to_end_tests/test_end_to_end.py"
diff --git a/tests/test_config.py b/tests/test_config.py
index 56407f744..95c3d948d 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -1,4 +1,6 @@
 import json
+import os
+from pathlib import Path
 
 import pytest
 import yaml
@@ -19,8 +21,14 @@ def json_with_tabs(d):
         ("example.json", json_with_tabs),
     ],
 )
-def test_load_from_path(tmp_path, filename, dump):
+@pytest.mark.parametrize("relative", (True, False), ids=("relative", "absolute"))
+def test_load_from_path(tmp_path: Path, filename, dump, relative):
     yml_file = tmp_path.joinpath(filename)
+    if relative:
+        if not os.getenv("TASKIPY"):
+            pytest.skip("Only test relative paths when running with `task check`")
+            return
+        yml_file = yml_file.relative_to(Path.cwd())
     override1 = {"class_name": "ExampleClass", "module_name": "example_module"}
     override2 = {"class_name": "DifferentClass", "module_name": "different_module"}
     data = {