diff --git a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDiagnosticFactory.kt b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDiagnosticFactory.kt
index e7a40ac8211..261f6268f61 100644
--- a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDiagnosticFactory.kt
+++ b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDiagnosticFactory.kt
@@ -18,6 +18,10 @@ sealed class AbstractFirDiagnosticFactory(
     val psiType: KClass<*>
 ) {
     abstract val firRenderer: FirDiagnosticRenderer
+
+    override fun toString(): String {
+        return name
+    }
 }
 
 class FirDiagnosticFactory0(