diff --git a/python/zensical/config.py b/python/zensical/config.py
index 409269f..ec0bcbd 100644
--- a/python/zensical/config.py
+++ b/python/zensical/config.py
@@ -678,6 +678,7 @@ def _apply_defaults(config: dict, path: str) -> dict:
 
     # Map plugins configuration to Markdown extensions
     _shim_autorefs(config)
+    _shim_markdown_exec(config)
     _shim_mkdocstrings(config, path)
     _shim_glightbox(config)
     _shim_macros(config)