diff --git a/tools/gn/command_desc.cc b/tools/gn/command_desc.cc
index 6203d01..76ba21c 100644
--- a/tools/gn/command_desc.cc
+++ b/tools/gn/command_desc.cc
@@ -56,7 +56,7 @@
       PrintValue(&iter.value(), indentLevel + 1);
       iter.Advance();
     }
-  } else if (value->IsType(base::Value::Type::NONE)) {
+  } else if (value->is_none()) {
     OutputString(indent + "<null>\n");
   }
 }