diff --git a/Source/cmLocalNinjaGenerator.cxx b/Source/cmLocalNinjaGenerator.cxx
index b2927a96e..6a5949c2a 100644
--- a/Source/cmLocalNinjaGenerator.cxx
+++ b/Source/cmLocalNinjaGenerator.cxx
@@ -400,7 +400,7 @@ cmLocalNinjaGenerator::WriteCustomCommandBuildStatement(
 
   bool symbolic = false;
   for (std::vector<std::string>::const_iterator o = outputs.begin();
-       o != outputs.end(); ++o)
+       !symbolic && o != outputs.end(); ++o)
     {
     if (cmSourceFile* sf = this->Makefile->GetSource(*o))
       {