diff --git a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/JavaSymbolProvider.kt b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/JavaSymbolProvider.kt
index 7d9db664102..a662cde93ef 100644
--- a/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/JavaSymbolProvider.kt
+++ b/compiler/fir/java/src/org/jetbrains/kotlin/fir/java/JavaSymbolProvider.kt
@@ -53,7 +53,7 @@ class JavaSymbolProvider(
                 session = session,
                 psi = null,
                 type = ConeClassTypeImpl(FirClassSymbol(classId!!), emptyArray()),
-                isNullable = true,
+                isMarkedNullable = true,
                 annotations = emptyList()
             )
         ).apply {
@@ -102,7 +102,7 @@ class JavaSymbolProvider(
         }
         return FirResolvedTypeImpl(
             session, psi = null, type = coneType,
-            isNullable = false, annotations = annotations.map { it.toFirAnnotationCall() }
+            isMarkedNullable = false, annotations = annotations.map { it.toFirAnnotationCall() }
         )
     }
 
@@ -110,7 +110,7 @@ class JavaSymbolProvider(
         if (this is JavaClassifierType) return toFirResolvedType()
         return FirResolvedTypeImpl(
             session, psi = null, type = ConeClassErrorType("Unexpected JavaType: $this"),
-            isNullable = false, annotations = emptyList()
+            isMarkedNullable = false, annotations = emptyList()
         )
     }
 
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirTypeResolveTransformer.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirTypeResolveTransformer.kt
index 784039b04f9..5587114d215 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirTypeResolveTransformer.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirTypeResolveTransformer.kt
@@ -121,7 +121,7 @@ open class FirTypeResolveTransformer(
         return FirResolvedFunctionTypeImpl(
             functionType.psi,
             functionType.session,
-            functionType.isNullable,
+            functionType.isMarkedNullable,
             functionType.annotations as MutableList<FirAnnotationCall>,
             functionType.receiverType,
             functionType.valueParameters as MutableList<FirValueParameter>,
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassSubstitutionScope.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassSubstitutionScope.kt
index cd2179e6d84..1924a8d59cf 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassSubstitutionScope.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassSubstitutionScope.kt
@@ -142,7 +142,7 @@ fun FirType.withReplacedConeType(newType: ConeKotlinType?): FirResolvedType {
 
     return FirResolvedTypeImpl(
         session, psi, newType,
-        isNullable,
+        isMarkedNullable,
         annotations
     )
 
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt
index 31ee36a8c7c..81041413c1e 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt
@@ -583,7 +583,7 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
     }
 
     override fun visitTypeWithNullability(typeWithNullability: FirTypeWithNullability) {
-        if (typeWithNullability.isNullable) {
+        if (typeWithNullability.isMarkedNullable) {
             print("?")
         }
     }
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/FirTypeWithNullability.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/FirTypeWithNullability.kt
index 46e80f00276..9b8356b49b2 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/FirTypeWithNullability.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/FirTypeWithNullability.kt
@@ -8,7 +8,7 @@ package org.jetbrains.kotlin.fir.types
 import org.jetbrains.kotlin.fir.visitors.FirVisitor
 
 interface FirTypeWithNullability : FirType {
-    val isNullable: Boolean
+    val isMarkedNullable: Boolean
 
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
         visitor.visitTypeWithNullability(this, data)
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirAbstractAnnotatedType.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirAbstractAnnotatedType.kt
index f10600b8b9c..43dcc17b066 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirAbstractAnnotatedType.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirAbstractAnnotatedType.kt
@@ -16,7 +16,7 @@ import org.jetbrains.kotlin.fir.visitors.FirTransformer
 abstract class FirAbstractAnnotatedType(
     final override val session: FirSession,
     final override val psi: PsiElement?,
-    final override val isNullable: Boolean
+    final override val isMarkedNullable: Boolean
 ) : FirTypeWithNullability {
     override val annotations = mutableListOf<FirAnnotationCall>()
 
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirResolvedFunctionTypeImpl.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirResolvedFunctionTypeImpl.kt
index ac0aea0d45e..7e1db045f82 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirResolvedFunctionTypeImpl.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirResolvedFunctionTypeImpl.kt
@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.fir.visitors.FirTransformer
 class FirResolvedFunctionTypeImpl(
     override val psi: PsiElement?,
     override val session: FirSession,
-    override val isNullable: Boolean,
+    override val isMarkedNullable: Boolean,
     override val annotations: MutableList<FirAnnotationCall>,
     override var receiverType: FirType?,
     override val valueParameters: MutableList<FirValueParameter>,
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirResolvedTypeImpl.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirResolvedTypeImpl.kt
index 0254f2b09ca..13aff9b96bc 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirResolvedTypeImpl.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/impl/FirResolvedTypeImpl.kt
@@ -15,6 +15,6 @@ class FirResolvedTypeImpl(
     override val session: FirSession,
     override val psi: PsiElement?,
     override val type: ConeKotlinType,
-    override val isNullable: Boolean,
+    override val isMarkedNullable: Boolean,
     override val annotations: List<FirAnnotationCall>
 ) : FirResolvedType
\ No newline at end of file