diff --git a/platform/workspaceModel/ide/src/com/intellij/workspaceModel/ide/jpsEntitySources.kt b/platform/workspaceModel/ide/src/com/intellij/workspaceModel/ide/jpsEntitySources.kt
index d75dc5dbe409..5380333f1c95 100644
--- a/platform/workspaceModel/ide/src/com/intellij/workspaceModel/ide/jpsEntitySources.kt
+++ b/platform/workspaceModel/ide/src/com/intellij/workspaceModel/ide/jpsEntitySources.kt
@@ -75,6 +75,10 @@ sealed class JpsFileEntitySource : EntitySource {
     override fun hashCode(): Int {
       return directory.hashCode() * 31 * 31 + projectLocation.hashCode() * 31 + fileNameId
     }
+
+    override fun toString(): String {
+      return "FileInDirectory(directory=$directory, fileNameId=$fileNameId, projectLocation=$projectLocation)"
+    }
   }
 }