diff --git a/setup.cfg b/setup.cfg
index d1a2f9a3598b..7f8c45c8c326 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -18,6 +18,10 @@ exclude = ^vendor/
 # some tests don't typecheck when this flag is set
 check_untyped_defs = false
 
+# Help mypy find imports when running against list of individual files.
+# Without this line it would behave differently when executed on the entire project.
+mypy_path = $MYPY_CONFIG_FILE_DIR:$MYPY_CONFIG_FILE_DIR/test_runner
+
 disallow_incomplete_defs = false
 disallow_untyped_calls = false
 disallow_untyped_decorators = false