diff --git a/java/openapi/src/com/intellij/psi/util/TypeConversionUtil.java b/java/openapi/src/com/intellij/psi/util/TypeConversionUtil.java
index fde48c62adb2..8124ac523fe1 100644
--- a/java/openapi/src/com/intellij/psi/util/TypeConversionUtil.java
+++ b/java/openapi/src/com/intellij/psi/util/TypeConversionUtil.java
@@ -919,8 +919,9 @@ public class TypeConversionUtil {
       substitutor = getSuperClassSubstitutorInner(superClass, derivedClass, derivedSubstitutor, visited, manager);
     }
     if (substitutor == null) {
-      LOG.error("Not inheritor: " + derivedClass + "(" + derivedClass.getClass().getName() + ");" +
-                " super: " + superClass + "(" + derivedClass.getClass().getName() + ")");
+      LOG.error(
+        "Not inheritor: " + derivedClass + "(" + derivedClass.getClass().getName() + "; " + PsiUtil.getVirtualFile(derivedClass) + ");" +
+        "\n super: " + superClass + "(" + superClass.getClass().getName() + "; " + PsiUtil.getVirtualFile(superClass) + ")");
     }
     return substitutor;
   }