diff --git a/tests/apis/namespace/basic/test.lua b/tests/apis/namespace/basic/test.lua
new file mode 100644
index 0000000000..83c0a95464
--- /dev/null
+++ b/tests/apis/namespace/basic/test.lua
@@ -0,0 +1,3 @@
+function main()
+    os.exec("xmake -vD")
+end
diff --git a/tests/apis/namespace/nested/test.lua b/tests/apis/namespace/nested/test.lua
new file mode 100644
index 0000000000..83c0a95464
--- /dev/null
+++ b/tests/apis/namespace/nested/test.lua
@@ -0,0 +1,3 @@
+function main()
+    os.exec("xmake -vD")
+end
diff --git a/xmake/core/base/interpreter.lua b/xmake/core/base/interpreter.lua
index 6445f9ad58..f6f9490479 100644
--- a/xmake/core/base/interpreter.lua
+++ b/xmake/core/base/interpreter.lua
@@ -954,6 +954,7 @@ function interpreter:api_register_scope(...)
         local scope_args = table.pack(...)
         local scope_name = scope_args[1]
         local scope_info = scope_args[2]
+        local namespace = self._NAMESPACE_STR
 
         -- check invalid scope name, @see https://github.com/xmake-io/xmake/issues/4547
         if scope_args.n > 0 and type(scope_name) ~= "string" then