diff --git a/Source/cmGlobalUnixMakefileGenerator3.cxx b/Source/cmGlobalUnixMakefileGenerator3.cxx
index 32c2a208c8..671dae2271 100644
--- a/Source/cmGlobalUnixMakefileGenerator3.cxx
+++ b/Source/cmGlobalUnixMakefileGenerator3.cxx
@@ -951,6 +951,9 @@ void cmGlobalUnixMakefileGenerator3::WriteHelpRule(
   if (!this->GlobalSettingIsOn("CMAKE_SUPPRESS_REGENERATION")) {
     lg->AppendEcho(commands, "... depend");
   }
+  if (this->CheckCMP0171()) {
+    lg->AppendEcho(commands, "... codegen");
+  }
 
   // Keep track of targets already listed.
   std::set<std::string> emittedTargets;