diff --git a/packages/cubejs-query-orchestrator/src/orchestrator/PreAggregationPartitionRangeLoader.ts b/packages/cubejs-query-orchestrator/src/orchestrator/PreAggregationPartitionRangeLoader.ts
index c81625a1e102f..c7e7cd0b360fb 100644
--- a/packages/cubejs-query-orchestrator/src/orchestrator/PreAggregationPartitionRangeLoader.ts
+++ b/packages/cubejs-query-orchestrator/src/orchestrator/PreAggregationPartitionRangeLoader.ts
@@ -295,6 +295,7 @@ export class PreAggregationPartitionRangeLoader {
       const unionTargetTableName = allTableTargetNames
         .map(targetTableName => `SELECT * FROM ${targetTableName}${emptyResult ? ' WHERE 1 = 0' : ''}`)
         .join(' UNION ALL ');
+
       return {
         targetTableName: allTableTargetNames.length === 1 && !emptyResult ? allTableTargetNames[0] : `(${unionTargetTableName})`,
         refreshKeyValues: loadResults.map(t => t.refreshKeyValues),
@@ -302,6 +303,7 @@ export class PreAggregationPartitionRangeLoader {
         buildRangeEnd: !emptyResult && loadResults.length && loadResults[loadResults.length - 1].buildRangeEnd,
         lambdaTable,
         rollupLambdaId: this.preAggregation.rollupLambdaId,
+        isMultiTableUnion: allTableTargetNames.length > 1,
       };
     } else {
       return new PreAggregationLoader(
diff --git a/packages/cubejs-query-orchestrator/src/orchestrator/PreAggregations.ts b/packages/cubejs-query-orchestrator/src/orchestrator/PreAggregations.ts
index 14c1150bb2c69..43604fc040234 100644
--- a/packages/cubejs-query-orchestrator/src/orchestrator/PreAggregations.ts
+++ b/packages/cubejs-query-orchestrator/src/orchestrator/PreAggregations.ts
@@ -142,6 +142,7 @@ export type LoadPreAggregationResult = {
   queryKey?: any[];
   rollupLambdaId?: string;
   partitionRange?: QueryDateRange;
+  isMultiTableUnion?: boolean;
 };
 
 export type PreAggregationTableToTempTable = [string, LoadPreAggregationResult];
@@ -515,7 +516,9 @@ export class PreAggregations {
             ...loadResult,
             type: p.type,
           };
-          await this.addTableUsed(usedPreAggregation.targetTableName);
+          if (!usedPreAggregation.isMultiTableUnion) {
+            await this.addTableUsed(usedPreAggregation.targetTableName);
+          }
 
           if (i === preAggregations.length - 1 && queryBody.values) {
             queryParamsReplacement = await loader.replaceQueryBuildRangeParams(