diff --git a/Source/cmStateSnapshot.cxx b/Source/cmStateSnapshot.cxx
index 778569f7bc..90c45bab7d 100644
--- a/Source/cmStateSnapshot.cxx
+++ b/Source/cmStateSnapshot.cxx
@@ -169,7 +169,7 @@ bool cmStateSnapshot::PopPolicy()
   return true;
 }
 
-bool cmStateSnapshot::CanPopPolicyScope()
+bool cmStateSnapshot::CanPopPolicyScope() const
 {
   return this->Position->Policies != this->Position->PolicyScope;
 }
@@ -243,7 +243,7 @@ bool cmStateSnapshot::PopDiagnostic()
   return true;
 }
 
-bool cmStateSnapshot::CanPopDiagnosticScope()
+bool cmStateSnapshot::CanPopDiagnosticScope() const
 {
   return this->Position->Diagnostics != this->Position->DiagnosticScope;
 }
diff --git a/Source/cmStateSnapshot.h b/Source/cmStateSnapshot.h
index d7f8bfc9af..da4e905b72 100644
--- a/Source/cmStateSnapshot.h
+++ b/Source/cmStateSnapshot.h
@@ -56,7 +56,7 @@ public:
                                      bool parent_scope = false) const;
   void PushPolicy(cmPolicies::PolicyMap const& entry, bool weak);
   bool PopPolicy();
-  bool CanPopPolicyScope();
+  bool CanPopPolicyScope() const;
 
   void SetDiagnostic(cmDiagnostics::DiagnosticCategory category,
                      cmDiagnostics::DiagnosticAction action, bool recursive);
@@ -77,7 +77,7 @@ public:
   }
   void PushDiagnostic(cmDiagnostics::DiagnosticMap entry, bool weak);
   bool PopDiagnostic();
-  bool CanPopDiagnosticScope();
+  bool CanPopDiagnosticScope() const;
 
   cmState* GetState() const;