diff --git a/src/net/sourceforge/plantuml/core/DiagramType.java b/src/net/sourceforge/plantuml/core/DiagramType.java
index 24a92b7e3..b01603de0 100644
--- a/src/net/sourceforge/plantuml/core/DiagramType.java
+++ b/src/net/sourceforge/plantuml/core/DiagramType.java
@@ -127,6 +127,9 @@ public enum DiagramType {
 		if (StartUtils.startsWithSymbolAnd("startfiles", s))
 			return FILES;
 
+		if (StartUtils.startsWithSymbolAnd("startchen", s))
+				return CHEN_EER;
+
 		return UNKNOWN;
 	}
 }