diff --git a/ingen/data_source/file_source.py b/ingen/data_source/file_source.py
index f25841e..0f2f77a 100644
--- a/ingen/data_source/file_source.py
+++ b/ingen/data_source/file_source.py
@@ -6,6 +6,7 @@
 
 from ingen.data_source.source import DataSource
 from ingen.reader.file_reader import ReaderFactory
+from ingen.utils.interpolators.Interpolator import Interpolator
 from ingen.utils.path_parser import PathParser
 from ingen.utils.timer import log_time
 
@@ -17,7 +18,7 @@ class FileSource(DataSource):
     This class represents a File source
     """
 
-    def __init__(self, source, params_map):
+    def __init__(self, source, params_map, interpolator=Interpolator()):
         """
         Loads a file
 
@@ -26,6 +27,7 @@ def __init__(self, source, params_map):
 
         """
         super().__init__(source.get('id'))
+        self.interpolator = interpolator
         if params_map.get('infile') and source['use_infile']:
             source['file_path'] = params_map['infile']
             self._src = source
@@ -61,7 +63,7 @@ def format_file_path(self, source, params_map):
         else:
             run_date = params_map.get('run_date', date.today())
 
-        path_parser = PathParser(run_date)
+        path_parser = PathParser(run_date, interpolator=self.interpolator)
         if 'file_path' in source:
             source['file_path'] = path_parser.parse(source['file_path'])
         return source
diff --git a/test/data_source/test_file_source.py b/test/data_source/test_file_source.py
index c5aaa24..04a0e8a 100644
--- a/test/data_source/test_file_source.py
+++ b/test/data_source/test_file_source.py
@@ -26,7 +26,7 @@ def setUp(self):
         self.params_map = {'query_params': {'table_name': 'positions'}, 'infile': {}}
         self.source = FileSource(self._src, self.params_map)
 
-    @patch('src.data_source.file_source.ReaderFactory')
+    @patch('ingen.data_source.file_source.ReaderFactory')
     def test_source_fetch(self, mock_reader_factory):
         fileReader = Mock()
         fileReader.read.return_value = pd.DataFrame()