diff --git a/packages/mermaid/src/diagrams/class/classDb.ts b/packages/mermaid/src/diagrams/class/classDb.ts
index 5600a4006..0e18d1e0f 100644
--- a/packages/mermaid/src/diagrams/class/classDb.ts
+++ b/packages/mermaid/src/diagrams/class/classDb.ts
@@ -215,7 +215,7 @@ export const cleanupLabel = function (label: string) {
 };
 
 /**
- * Called by parser when a special node is found, e.g. a clickable element.
+ * Called by parser when assigning cssClass to a class
  *
  * @param ids - Comma separated list of ids
  * @param className - Class to add
diff --git a/packages/mermaid/src/diagrams/class/classDiagram.spec.ts b/packages/mermaid/src/diagrams/class/classDiagram.spec.ts
index fb719658e..e3dbb17f1 100644
--- a/packages/mermaid/src/diagrams/class/classDiagram.spec.ts
+++ b/packages/mermaid/src/diagrams/class/classDiagram.spec.ts
@@ -409,6 +409,7 @@ class C13["With Città foreign language"]
             },
           ],
           "methods": [],
+          "styles": [],
           "type": "",
         }
       `);
diff --git a/packages/mermaid/src/diagrams/class/parser/classDiagram.jison b/packages/mermaid/src/diagrams/class/parser/classDiagram.jison
index 70e9753f1..ed4e72027 100644
--- a/packages/mermaid/src/diagrams/class/parser/classDiagram.jison
+++ b/packages/mermaid/src/diagrams/class/parser/classDiagram.jison
@@ -377,7 +377,7 @@ styleStatement
     ;
 
 cssClassStatement
-    : CSSCLASS STR stylesOpt                            {yy.setCssClass($2, $3);}
+    : CSSCLASS STR ALPHA                            {yy.setCssClass($2, $3);}
     ;
 
 stylesOpt