diff --git a/service/src/main/groovy/org/olf/combination/CombinationRuleHelpers.groovy b/service/src/main/groovy/org/olf/combination/CombinationRuleHelpers.groovy
index 4285c64..382fafb 100644
--- a/service/src/main/groovy/org/olf/combination/CombinationRuleHelpers.groovy
+++ b/service/src/main/groovy/org/olf/combination/CombinationRuleHelpers.groovy
@@ -62,7 +62,7 @@ public class CombinationRuleHelpers {
 	}
 	
 	
-	public static Closure rulePatternValidator = { CombinationPattern value, CombinationRule instance, Errors err ->
+	public final static Closure rulePatternValidator = { CombinationPattern value, CombinationRule instance, Errors err ->
 		validateRulePattern( value, instance, err )
 	}
 	
diff --git a/service/src/main/groovy/org/olf/omission/OmissionRuleHelpers.groovy b/service/src/main/groovy/org/olf/omission/OmissionRuleHelpers.groovy
index 5cbe4c3..4e2b751 100644
--- a/service/src/main/groovy/org/olf/omission/OmissionRuleHelpers.groovy
+++ b/service/src/main/groovy/org/olf/omission/OmissionRuleHelpers.groovy
@@ -61,7 +61,7 @@ public class OmissionRuleHelpers {
 	}
 	
 	
-	public static Closure rulePatternValidator = { OmissionPattern value, OmissionRule instance, Errors err ->
+	public final static Closure rulePatternValidator = { OmissionPattern value, OmissionRule instance, Errors err ->
 		validateRulePattern( value, instance, err )
 	}
 	
diff --git a/service/src/main/groovy/org/olf/recurrence/RecurrenceRuleHelpers.groovy b/service/src/main/groovy/org/olf/recurrence/RecurrenceRuleHelpers.groovy
index b72c8ce..c5877ad 100644
--- a/service/src/main/groovy/org/olf/recurrence/RecurrenceRuleHelpers.groovy
+++ b/service/src/main/groovy/org/olf/recurrence/RecurrenceRuleHelpers.groovy
@@ -61,7 +61,7 @@ public class RecurrenceRuleHelpers {
 	}
 	
 	
-	public static Closure rulePatternValidator = { RecurrencePattern value, RecurrenceRule instance, Errors err ->
+	public final static Closure rulePatternValidator = { RecurrencePattern value, RecurrenceRule instance, Errors err ->
 		validateRulePattern( value, instance, err )
 	}