diff --git a/augpathlib/remotes.py b/augpathlib/remotes.py
index 990c748..459be9b 100644
--- a/augpathlib/remotes.py
+++ b/augpathlib/remotes.py
@@ -70,8 +70,8 @@ def anchorTo(cls, cache_anchor):
                 cls.init(cache_anchor.id)
 
             if cls.root != cache_anchor.id:
-                raise ValueError(f'root and anchor ids do not match! '
-                                 '{cls.root} != {cache_anchor.id}')
+                raise ValueError('root and anchor ids do not match! '
+                                 f'{cls.root} != {cache_anchor.id}')
 
             cls._cache_anchor = cache_anchor
         else: