diff --git a/pkg/sql/colexec/external_hash_aggregator.go b/pkg/sql/colexec/external_hash_aggregator.go
index 60d5a0e360ba..553ac061d363 100644
--- a/pkg/sql/colexec/external_hash_aggregator.go
+++ b/pkg/sql/colexec/external_hash_aggregator.go
@@ -100,7 +100,7 @@ func NewExternalHashAggregator(
 	// sort isn't accounted for when considering the number file descriptors to
 	// acquire. Not urgent, but it should be fixed.
 	maxNumberActivePartitions := calculateMaxNumberActivePartitions(flowCtx, args, ehaNumRequiredActivePartitions)
-	return createDiskBackedSorter(eha, args.Spec.ResultTypes, outputOrdering.Columns, maxNumberActivePartitions)
+	return createDiskBackedSorter(eha, newAggArgs.OutputTypes, outputOrdering.Columns, maxNumberActivePartitions)
 }
 
 // HashAggregationDiskSpillingEnabled is a cluster setting that allows to
diff --git a/pkg/sql/logictest/testdata/logic_test/aggregate b/pkg/sql/logictest/testdata/logic_test/aggregate
index be1bc7ad454d..5e7ae7730b8c 100644
--- a/pkg/sql/logictest/testdata/logic_test/aggregate
+++ b/pkg/sql/logictest/testdata/logic_test/aggregate
@@ -3840,3 +3840,9 @@ SELECT a, b, count(*) FROM t63159 GROUP BY a,b ORDER BY a
 2  2  1
 3  3  1
 5  5  1
+
+# Regression test for the vectorized hash aggregator using incorrect type schema
+# when planning an external sort to maintain the required ordering.
+statement ok
+CREATE TABLE t63436 (a INT, b FLOAT, c DECIMAL, INDEX(a));
+SELECT count(*) FROM t63436@t63436_a_idx GROUP BY b, c ORDER BY c;