diff --git a/syntaxes/rpgle.tmLanguage.json b/syntaxes/rpgle.tmLanguage.json
index 6614e49..6533455 100644
--- a/syntaxes/rpgle.tmLanguage.json
+++ b/syntaxes/rpgle.tmLanguage.json
@@ -750,7 +750,7 @@
 				},
 				{
 					"name": "keyword.other.rpgle",
-					"match": ":|\\.|\\,|\\*{1,2}(=)?|=|<>|((<|>|\\+|\\-|\\/)(=)?)|((\\b(?i)(TO|BY|DOWNTO|AND|OR|NOT)\\b))"
+					"match": ":|\\.|\\,|\\*{1,2}(=)?|=|<>|((<|>|\\+|\\-|\\/)(=)?)|((\\b(?i)(TO|BY|DOWNTO|AND|IN|OR|NOT)\\b))"
 				},
 				{
 					"name": "keyword.other.rpgle.bif",