diff --git a/packages/mermaid/src/diagrams/sankey/parser/sankey.jison b/packages/mermaid/src/diagrams/sankey/parser/sankey.jison
index a81c61620..9d66b69a4 100644
--- a/packages/mermaid/src/diagrams/sankey/parser/sankey.jison
+++ b/packages/mermaid/src/diagrams/sankey/parser/sankey.jison
@@ -11,7 +11,6 @@
 %lex
 
 %options case-insensitive
-%options easy_keyword_rules
 
 %x escaped_text
 %x csv