diff --git a/Source/cmNinjaTargetGenerator.h b/Source/cmNinjaTargetGenerator.h
index 40a15a3ac..17cf517f6 100644
--- a/Source/cmNinjaTargetGenerator.h
+++ b/Source/cmNinjaTargetGenerator.h
@@ -116,7 +116,6 @@ protected:
   void WriteObjectBuildStatements();
   void WriteObjectBuildStatement(cmSourceFile const* source,
                                  bool writeOrderDependsTargetForTarget);
-  void WriteCustomCommandBuildStatement(cmCustomCommand *cc);
 
   cmNinjaDeps GetObjects() const
   { return this->Objects; }