diff --git a/rbtools/__init__.py b/rbtools/__init__.py
index b15e957938de850e0f141ac57467e6a837308f27..047a2712f2d19f53270594e0b59c070337bcca1e 100644
--- a/rbtools/__init__.py
+++ b/rbtools/__init__.py
@@ -29,10 +29,10 @@
     version = f'{major}.{minor}'
 
     if micro or patch:
-        version += '.{micro}'
+        version += f'.{micro}'
 
         if patch:
-            version += '.{patch}'
+            version += f'.{patch}'
 
     if tag != 'final':
         if tag == 'rc':