diff --git a/compiler/fir/providers/src/org/jetbrains/kotlin/fir/types/TypeUtils.kt b/compiler/fir/providers/src/org/jetbrains/kotlin/fir/types/TypeUtils.kt
index 0f70318429d..bee86c01c1a 100644
--- a/compiler/fir/providers/src/org/jetbrains/kotlin/fir/types/TypeUtils.kt
+++ b/compiler/fir/providers/src/org/jetbrains/kotlin/fir/types/TypeUtils.kt
@@ -165,6 +165,7 @@ fun <T : ConeKotlinType> T.withNullability(
             ConeNullability.UNKNOWN -> this // TODO: is that correct?
             ConeNullability.NOT_NULL -> this
         }
+        is ConeStubTypeForSyntheticFixation -> ConeStubTypeForSyntheticFixation(constructor, nullability)
         is ConeStubTypeForChainInference -> ConeStubTypeForChainInference(constructor, nullability)
         is ConeStubTypeForTypeVariableInSubtyping -> ConeStubTypeForTypeVariableInSubtyping(constructor, nullability)
         is ConeDefinitelyNotNullType -> when (nullability) {