diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/renderer/ConeTypeIdeRenderer.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/renderer/ConeTypeIdeRenderer.kt
index 42e9dd30dd9..2a456ff1d17 100644
--- a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/renderer/ConeTypeIdeRenderer.kt
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/renderer/ConeTypeIdeRenderer.kt
@@ -90,6 +90,11 @@ internal class ConeTypeIdeRenderer(
                 append(type.render())
                 renderNullability(type.type)
             }
+            is ConeDefinitelyNotNullType -> {
+                renderAnnotationList(annotations)
+                append(renderType(type.original))
+                append("!!")
+            }
             else -> appendError("Unexpected cone type ${type::class.qualifiedName}")
         }
     }