diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 9fff4dc62b..b027244cca 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -2407,8 +2407,8 @@ bool cmGlobalGenerator::IsExcluded(cmStateSnapshot const& rootSnp,
   return false;
 }
 
-bool cmGlobalGenerator::IsExcluded(cmLocalGenerator* root,
-                                   cmLocalGenerator* gen) const
+bool cmGlobalGenerator::IsExcluded(cmLocalGenerator const* root,
+                                   cmLocalGenerator const* gen) const
 {
   assert(gen);
 
@@ -2418,7 +2418,7 @@ bool cmGlobalGenerator::IsExcluded(cmLocalGenerator* root,
   return this->IsExcluded(rootSnp, snp);
 }
 
-bool cmGlobalGenerator::IsExcluded(cmLocalGenerator* root,
+bool cmGlobalGenerator::IsExcluded(cmLocalGenerator const* root,
                                    cmGeneratorTarget const* target) const
 {
   if (!target->IsInBuildSystem()) {
diff --git a/Source/cmGlobalGenerator.h b/Source/cmGlobalGenerator.h
index b7ea6a9286..609f7bda9d 100644
--- a/Source/cmGlobalGenerator.h
+++ b/Source/cmGlobalGenerator.h
@@ -724,8 +724,9 @@ protected:
   void CheckTargetProperties();
   bool IsExcluded(cmStateSnapshot const& root,
                   cmStateSnapshot const& snp) const;
-  bool IsExcluded(cmLocalGenerator* root, cmLocalGenerator* gen) const;
-  bool IsExcluded(cmLocalGenerator* root,
+  bool IsExcluded(cmLocalGenerator const* root,
+                  cmLocalGenerator const* gen) const;
+  bool IsExcluded(cmLocalGenerator const* root,
                   cmGeneratorTarget const* target) const;
   virtual void InitializeProgressMarks() {}