diff --git a/core/trino-main/src/main/java/io/trino/sql/planner/optimizations/BeginTableWrite.java b/core/trino-main/src/main/java/io/trino/sql/planner/optimizations/BeginTableWrite.java
index a1a6016231c1..03780bbed88f 100644
--- a/core/trino-main/src/main/java/io/trino/sql/planner/optimizations/BeginTableWrite.java
+++ b/core/trino-main/src/main/java/io/trino/sql/planner/optimizations/BeginTableWrite.java
@@ -272,7 +272,7 @@ private WriterTarget createWriterTarget(WriterTarget target, PlanNode planNode)
         private static List<TableHandle> findSourceTableHandles(PlanNode startNode)
         {
             return PlanNodeSearcher.searchFrom(startNode)
-                    .where(TableScanNode.class::isInstance)
+                    .where(node -> node instanceof TableScanNode tableScanNode && !tableScanNode.isUpdateTarget())
                     .findAll()
                     .stream()
                     .map(TableScanNode.class::cast)