diff --git a/app/src/main/java/eu/faircode/email/ExpressionHelper.java b/app/src/main/java/eu/faircode/email/ExpressionHelper.java
index b367c34b8f..ecbde10e77 100644
--- a/app/src/main/java/eu/faircode/email/ExpressionHelper.java
+++ b/app/src/main/java/eu/faircode/email/ExpressionHelper.java
@@ -693,7 +693,7 @@ public class ExpressionHelper {
         @Override
         public EvaluationValue evaluate(
                 Expression expression, Token operatorToken, EvaluationValue... operands) {
-            String result = null;
+            Object result = null;
 
             try {
                 if (operands.length == 2) {