diff --git a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/ClassMemberGenerator.kt b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/ClassMemberGenerator.kt
index ab8e0c9a8a6..db112945e3d 100644
--- a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/ClassMemberGenerator.kt
+++ b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/ClassMemberGenerator.kt
@@ -317,7 +317,7 @@ internal class ClassMemberGenerator(
             } else {
                 IrDelegatingConstructorCallImpl(
                     startOffset, endOffset,
-                    constructedIrType,
+                    irBuiltIns.unitType,
                     irConstructorSymbol,
                     typeArgumentsCount = constructor.typeParameters.size,
                     valueArgumentsCount = irConstructorSymbol.owner.valueParameters.size