diff --git a/poi/src/main/java/org/apache/poi/hssf/record/aggregates/CFRecordsAggregate.java b/poi/src/main/java/org/apache/poi/hssf/record/aggregates/CFRecordsAggregate.java
index bbfe353873..b5da3a91c5 100644
--- a/poi/src/main/java/org/apache/poi/hssf/record/aggregates/CFRecordsAggregate.java
+++ b/poi/src/main/java/org/apache/poi/hssf/record/aggregates/CFRecordsAggregate.java
@@ -63,7 +63,7 @@ public final class CFRecordsAggregate extends RecordAggregate implements Generic
 
     public CFRecordsAggregate(CFRecordsAggregate other) {
         header = other.header.copy();
-        other.rules.stream().map(t -> t.copy()).forEach(rules::add);
+        other.rules.stream().map(CFRuleBase::copy).forEach(rules::add);
     }
 
     private CFRecordsAggregate(CFHeaderBase pHeader, CFRuleBase[] pRules) {