diff --git a/gittensor/classes.py b/gittensor/classes.py
index 4856d474..fa3e84f0 100644
--- a/gittensor/classes.py
+++ b/gittensor/classes.py
@@ -74,9 +74,11 @@ def __post_init__(self):
 
     def _calculate_file_extension(self) -> str:
         basename = self.filename.split('/')[-1]
+        basename_lower = basename.lower()
+        if basename_lower.startswith('dockerfile.'):
+            return 'dockerfile'
         if '.' in basename:
             return basename.split('.')[-1].lower()
-        basename_lower = basename.lower()
         return basename_lower if basename_lower in EXTENSIONLESS_FILE_EXTENSIONS else ''
 
     def is_test_file(self) -> bool:
diff --git a/tests/test_classes.py b/tests/test_classes.py
index 9f4f47cc..e064a8a4 100644
--- a/tests/test_classes.py
+++ b/tests/test_classes.py
@@ -78,6 +78,8 @@ def test_is_test_file_preserves_existing_test_conventions():
         ('Dockerfile', 'dockerfile'),
         ('dockerfile', 'dockerfile'),
         ('ops/Dockerfile', 'dockerfile'),
+        ('Dockerfile.dev', 'dockerfile'),
+        ('ops/Dockerfile.prod', 'dockerfile'),
         ('Makefile', 'makefile'),
         ('makefile', 'makefile'),
         ('build.mk', 'mk'),