diff --git a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters1.java b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters1.java
index 63792c43e03..83a606e7a7b 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters1.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters1.java
@@ -46,6 +46,6 @@ public class DiagnosticWithParameters1<E extends PsiElement, A> extends Abstract
 
     @Override
     public String toString() {
-        return "(a = " + a + ")";
+        return getFactory() + "(a = " + a + ")";
     }
 }
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters2.java b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters2.java
index 1e56652a18b..0adfa0f139b 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters2.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters2.java
@@ -54,6 +54,6 @@ public class DiagnosticWithParameters2<E extends PsiElement, A, B> extends Abstr
 
     @Override
     public String toString() {
-        return "(a = " + a + ", b = " + b + ")";
+        return getFactory() + "(a = " + a + ", b = " + b + ")";
     }
 }
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters3.java b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters3.java
index 040e844a2ad..9e9ba8b6da5 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters3.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/DiagnosticWithParameters3.java
@@ -62,6 +62,6 @@ public class DiagnosticWithParameters3<E extends PsiElement, A, B, C> extends Ab
 
     @Override
     public String toString() {
-        return "(a = " + a + ", b = " + b + ", c = " + c + ")";
+        return getFactory() + "(a = " + a + ", b = " + b + ", c = " + c + ")";
     }
 }