diff --git a/Source/cmCacheManager.cxx b/Source/cmCacheManager.cxx
index 9e0064e5d..cc9fa5767 100644
--- a/Source/cmCacheManager.cxx
+++ b/Source/cmCacheManager.cxx
@@ -750,11 +750,7 @@ void cmCacheManager::AddCacheEntry(const char* key,
     }
   e.SetProperty("HELPSTRING", helpString? helpString :
                 "(This variable does not exist and should not be used)");
-  if (this->Cache[key].Value == e.Value)
-    {
-    this->CMakeInstance->UnwatchUnusedCli(key);
-    }
-  this->Cache[key] = e;
+  this->CMakeInstance->UnwatchUnusedCli(key);
 }
 
 bool cmCacheManager::CacheIterator::IsAtEnd() const