diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/impl/FirTypeResolverImpl.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/impl/FirTypeResolverImpl.kt
index bfc154c6053..0f7c4528bc5 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/impl/FirTypeResolverImpl.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/impl/FirTypeResolverImpl.kt
@@ -88,7 +88,8 @@ class FirTypeResolverImpl(private val session: FirSession) : FirTypeResolver {
     private fun createFunctionalType(typeRef: FirFunctionTypeRef): ConeClassType {
         val parameters =
             listOfNotNull((typeRef.receiverTypeRef as FirResolvedTypeRef?)?.type) +
-                    typeRef.valueParameters.map { it.returnTypeRef.coneTypeUnsafe<ConeKotlinType>() }
+                    typeRef.valueParameters.map { it.returnTypeRef.coneTypeUnsafe<ConeKotlinType>() } +
+                    listOf(typeRef.returnTypeRef.coneTypeUnsafe())
         return ConeClassTypeImpl(
             resolveBuiltInQualified(KotlinBuiltIns.getFunctionClassId(typeRef.parametersCount), session).toLookupTag(),
             parameters.toTypedArray(),
diff --git a/compiler/fir/resolve/testData/resolve/arguments/lambda.txt b/compiler/fir/resolve/testData/resolve/arguments/lambda.txt
index 11c847f0520..3e9f03d753e 100644
--- a/compiler/fir/resolve/testData/resolve/arguments/lambda.txt
+++ b/compiler/fir/resolve/testData/resolve/arguments/lambda.txt
@@ -1,9 +1,9 @@
 FILE: lambda.kt
-    public final fun foo(f: R|kotlin/Function0|): R|kotlin/Unit| {
+    public final fun foo(f: R|kotlin/Function0<kotlin/Unit>|): R|kotlin/Unit| {
     }
-    public final fun bar(x: R|kotlin/Int|, f: R|kotlin/Function0|): R|kotlin/Unit| {
+    public final fun bar(x: R|kotlin/Int|, f: R|kotlin/Function0<kotlin/Unit>|): R|kotlin/Unit| {
     }
-    public final fun baz(f: R|kotlin/Function0|, other: R|kotlin/Boolean| = Boolean(true)): R|kotlin/Unit| {
+    public final fun baz(f: R|kotlin/Function0<kotlin/Unit>|, other: R|kotlin/Boolean| = Boolean(true)): R|kotlin/Unit| {
     }
     public final fun test(): R|kotlin/Unit| {
         R|/foo|(<L> = foo@fun <implicit>.<anonymous>(): <implicit> {
diff --git a/compiler/fir/resolve/testData/resolve/ft.txt b/compiler/fir/resolve/testData/resolve/ft.txt
index b8069a6bdda..a96bea8efb5 100644
--- a/compiler/fir/resolve/testData/resolve/ft.txt
+++ b/compiler/fir/resolve/testData/resolve/ft.txt
@@ -1,5 +1,5 @@
 FILE: ft.kt
     public abstract interface KMutableProperty1<T> : R|KProperty1<T>| {
     }
-    public abstract interface KProperty1<T> : R|kotlin/Function1| {
+    public abstract interface KProperty1<T> : R|kotlin/Function1<T, kotlin/Int>| {
     }
diff --git a/compiler/fir/resolve/testData/resolve/functionTypes.txt b/compiler/fir/resolve/testData/resolve/functionTypes.txt
index f927b47d810..43e3ea86178 100644
--- a/compiler/fir/resolve/testData/resolve/functionTypes.txt
+++ b/compiler/fir/resolve/testData/resolve/functionTypes.txt
@@ -1,15 +1,15 @@
 FILE: functionTypes.kt
-    public final fun <T> simpleRun(f: R|kotlin/Function1|): R|kotlin/Unit| {
+    public final fun <T> simpleRun(f: R|kotlin/Function1<T, kotlin/Unit>|): R|kotlin/Unit| {
         ^simpleRun <Unresolved name: f>#()
     }
-    public final fun <T, R> R|kotlin/collections/List<T>|.simpleMap(f: R|kotlin/Function1|): R|R| {
+    public final fun <T, R> R|kotlin/collections/List<T>|.simpleMap(f: R|kotlin/Function1<T, R>|): R|R| {
     }
-    public final fun <T> simpleWith(t: R|T|, f: R|kotlin/Function1|): R|kotlin/Unit| {
+    public final fun <T> simpleWith(t: R|T|, f: R|kotlin/Function1<T, kotlin/Unit>|): R|kotlin/Unit| {
         ^simpleWith R|<local>/t|.<Unresolved name: f>#()
     }
     public abstract interface KMutableProperty1<T, R> : R|KProperty1<T, R>|, R|KMutableProperty<R>| {
     }
-    public abstract interface KProperty1<T, out R> : R|KProperty<R>|, R|kotlin/Function1| {
+    public abstract interface KProperty1<T, out R> : R|KProperty<R>|, R|kotlin/Function1<T, R>| {
     }
     public abstract interface KProperty<out R> : R|kotlin/Any| {
     }