diff --git a/PyTeX/build/build/pytex_config.py b/PyTeX/build/build/pytex_config.py
index 095a755..48e13f2 100644
--- a/PyTeX/build/build/pytex_config.py
+++ b/PyTeX/build/build/pytex_config.py
@@ -22,7 +22,7 @@ class PyTeXConfig(Config):
 
         self._force_mode: Optional[bool] = None
 
-        self._configs: Optional[Dict] = None
+        self._configs: Optional[Dict[str, FormattingConfig]] = None
 
     def to_json(self) -> Dict:
         return {
@@ -35,7 +35,10 @@ class PyTeXConfig(Config):
                 YAML_DIRS: self.build_dir_specification.to_json()
             },
             YAML_DEFAULT: self.default_formatting_config.to_json(),
-            YAML_CONFIGS: self._configs
+            YAML_CONFIGS: {
+                filename: config.to_json()
+                for filename, config in self._configs.items()
+            } if self._configs else None
         }
 
     def set_from_json(self, content: Optional[Dict]):
diff --git a/PyTeX/format/formatting_config.py b/PyTeX/format/formatting_config.py
index 537bed5..c0cc51a 100644
--- a/PyTeX/format/formatting_config.py
+++ b/PyTeX/format/formatting_config.py
@@ -94,10 +94,10 @@ class FormattingConfig(Config):
         return {
             YAML_INFO: {
                 YAML_AUTHOR: self._author,
-                YAML_NAMING_SCHEME: self._naming_scheme,
-                YAML_TEX_FLAVOUR: self._tex_flavour,
-                YAML_TEX_TYPE: self._tex_type,
-                YAML_TEX_OUT_TYPE: self._tex_out_type,
+                YAML_NAMING_SCHEME: self._naming_scheme.value if self._naming_scheme else None,
+                YAML_TEX_FLAVOUR: self._tex_flavour.value if self._tex_flavour else None,
+                YAML_TEX_TYPE: self._tex_type.value if self._tex_type else None,
+                YAML_TEX_OUT_TYPE: self._tex_out_type.value if self._tex_out_type else None,
                 YAML_VERSION: self._version,
                 YAML_DESCRIPTION: self._description
             },