diff --git a/tools/gn/operators.cc b/tools/gn/operators.cc
index 33fbcb2..ad25159 100644
--- a/tools/gn/operators.cc
+++ b/tools/gn/operators.cc
@@ -312,7 +312,7 @@
       }
       break;
 
-    default:
+    case Value::NONE:
       break;
   }
 }
diff --git a/tools/gn/value.cc b/tools/gn/value.cc
index aff4ab1..dc81a37 100644
--- a/tools/gn/value.cc
+++ b/tools/gn/value.cc
@@ -197,7 +197,10 @@
       return true;
     case Value::SCOPE:
       return scope_value()->CheckCurrentScopeValuesEqual(other.scope_value());
+    case Value::NONE:
+      return false;
     default:
+      NOTREACHED();
       return false;
   }
 }