diff --git a/ir/inst_aggregate.go b/ir/inst_aggregate.go
index e574d1cd..52187099 100644
--- a/ir/inst_aggregate.go
+++ b/ir/inst_aggregate.go
@@ -98,6 +98,7 @@ func NewInsertValue(x, elem value.Value, indices ...uint64) *InstInsertValue {
 	}
 	inst := &InstInsertValue{X: x, Elem: elem, Indices: indices}
 	// Compute type.
+	inst.Type()
 	return inst
 }