diff --git a/velox/exec/fuzzer/DuckQueryRunner.cpp b/velox/exec/fuzzer/DuckQueryRunner.cpp
index 6fdf10613bb69..472b53230c8ef 100644
--- a/velox/exec/fuzzer/DuckQueryRunner.cpp
+++ b/velox/exec/fuzzer/DuckQueryRunner.cpp
@@ -450,6 +450,8 @@ std::optional<std::string> DuckQueryRunner::toSql(
     const std::shared_ptr<const core::NestedLoopJoinNode>& joinNode) {
   std::stringstream sql;
 
+  sql << "SELECT " << folly::join(", ", outputNames);
+
   // Nested loop join without filter.
   VELOX_CHECK(
       joinNode->joinCondition() == nullptr,
diff --git a/velox/exec/fuzzer/PrestoQueryRunner.cpp b/velox/exec/fuzzer/PrestoQueryRunner.cpp
index 0ff5021167e22..d376aefaeda6b 100644
--- a/velox/exec/fuzzer/PrestoQueryRunner.cpp
+++ b/velox/exec/fuzzer/PrestoQueryRunner.cpp
@@ -670,6 +670,8 @@ std::optional<std::string> PrestoQueryRunner::toSql(
     const std::shared_ptr<const core::NestedLoopJoinNode>& joinNode) {
   std::stringstream sql;
 
+  sql << "SELECT " << folly::join(", ", outputNames);
+
   // Nested loop join without filter.
   VELOX_CHECK(
       joinNode->joinCondition() == nullptr,