diff --git a/asdf/config.py b/asdf/config.py
index cb78d0642..387951e07 100644
--- a/asdf/config.py
+++ b/asdf/config.py
@@ -416,24 +416,15 @@ def validate_on_read(self, value):
     def __repr__(self):
         return (
             "<AsdfConfig\n"
-            "  array_inline_threshold: {}\n"
-            "  all_array_storage: {}\n"
-            "  all_array_compression: {}\n"
-            "  all_array_compression_kwargs: {}\n"
-            "  default_version: {}\n"
-            "  io_block_size: {}\n"
-            "  legacy_fill_schema_defaults: {}\n"
-            "  validate_on_read: {}\n"
+            f"  array_inline_threshold: {self.array_inline_threshold}\n"
+            f"  all_array_storage: {self.all_array_storage}\n"
+            f"  all_array_compression: {self.all_array_compression}\n"
+            f"  all_array_compression_kwargs: {self.all_array_compression_kwargs}\n"
+            f"  default_version: {self.default_version}\n"
+            f"  io_block_size: {self.io_block_size}\n"
+            f"  legacy_fill_schema_defaults: {self.legacy_fill_schema_defaults}\n"
+            f"  validate_on_read: {self.validate_on_read}\n"
             ">"
-        ).format(
-            self.array_inline_threshold,
-            self.all_array_storage,
-            self.all_array_compression,
-            self.all_array_compression_kwargs,
-            self.default_version,
-            self.io_block_size,
-            self.legacy_fill_schema_defaults,
-            self.validate_on_read,
         )