diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/FirDeclarationsResolveTransformer.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/FirDeclarationsResolveTransformer.kt
index 42881d93694..16406b89295 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/FirDeclarationsResolveTransformer.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/FirDeclarationsResolveTransformer.kt
@@ -692,6 +692,7 @@ open class FirDeclarationsResolveTransformer(transformer: FirBodyResolveTransfor
                             lambda.valueParameters.isEmpty() && singleParameterType != null -> {
                                 val name = Name.identifier("it")
                                 val itParam = buildValueParameter {
+                                    source = lambda.source?.fakeElement(FirFakeSourceElementKind.ItLambdaParameter)
                                     session = this@FirDeclarationsResolveTransformer.session
                                     origin = FirDeclarationOrigin.Source
                                     returnTypeRef = buildResolvedTypeRef { type = singleParameterType }