diff --git a/hooks/kroki.py b/hooks/kroki.py
index 05ebf0e..be93514 100644
--- a/hooks/kroki.py
+++ b/hooks/kroki.py
@@ -13,6 +13,11 @@ from scour.scour import scourString
 
 logger = get_plugin_logger("kroki")
 
+DIAGRAM_TYPES = {
+    "blockdiag",
+    "mermaid"
+}
+
 DIAGRAM_CACHE_TIME = timedelta(days=7)
 
 def get_kroki_diagram(source, language):
@@ -49,15 +54,11 @@ def on_config(config):
 
     custom_fences = [
         {
-            "name": "blockdiag",
-            "class": "blockdiag",
-            "format": partial(fence_div_format, config["site_dir"])
-        },
-        {
-            "name": "mermaid",
-            "class": "mermaid",
+            "name": diagram,
+            "class": diagram,
             "format": partial(fence_div_format, config["site_dir"])
         }
+        for diagram in DIAGRAM_TYPES
     ]
 
     config.mdx_configs["pymdownx.superfences"] = {