diff --git a/fault/file.py b/fault/file.py
index 695300f5..5c22ad4b 100644
--- a/fault/file.py
+++ b/fault/file.py
@@ -8,7 +8,10 @@ def __init__(self, name, tester, mode, chunk_size):
         self.tester = tester
         self.mode = mode
         self.chunk_size = chunk_size
-        self.name_without_ext = os.path.splitext(self.name)[0]
+        basename = os.path.basename(self.name)
+        filename = os.path.splitext(basename)[0]
+        filename = filename.replace(".", "_")
+        self.name_without_ext = filename
 
     def __str__(self):
         return f'File<"{self.name}">'