diff --git a/src/InSillyCloWeb/assemblies/models.py b/src/InSillyCloWeb/assemblies/models.py
index 4fefcbbacf175f8b153a6e11663274e7e9804dba..d2dd6116506cb0d0dce7dceeb328b25080e56001 100644
--- a/src/InSillyCloWeb/assemblies/models.py
+++ b/src/InSillyCloWeb/assemblies/models.py
@@ -210,7 +210,7 @@ class Assembly(models.Model):
     def __str__(self):
         return self.name
 
-    def get_template(self, observer, input_parts:List[InputPart] = None) -> Tuple[BytesIO, str, str]:
+    def get_template(self, observer, input_parts: List[InputPart] = None) -> Tuple[BytesIO, str, str]:
         filename = re.sub(r'[^\w .-]', '', self.name) + '.xlsx'
         filename = filename.replace("..", ".")
         with NamedTemporaryFile(suffix=".xlsx") as template: