diff --git a/xmake/core/project/config.lua b/xmake/core/project/config.lua
index 789eada094..3e53fe3884 100644
--- a/xmake/core/project/config.lua
+++ b/xmake/core/project/config.lua
@@ -52,6 +52,23 @@ function config._use_workingdir()
     return use_workingdir
 end
 
+-- the current config is belong to the given config values?
+function config._is_value(value, ...)
+    if value == nil then
+        return false
+    end
+
+    value = tostring(value)
+    for _, v in ipairs(table.pack(...)) do
+        -- escape '-'
+        v = tostring(v)
+        if value == v or value:find("^" .. v:gsub("%-", "%%-") .. "$") then
+            return true
+        end
+    end
+    return false
+end
+
 -- get the current given configuration
 function config.get(name)
     local value = nil
@@ -278,24 +295,6 @@ function config.is_cross()
     return is_cross(config.plat(), config.arch())
 end
 
--- the current config is belong to the given config values?
-function config.is_value(name, ...)
-    local value = config.get(name)
-    if value == nil then
-        return false
-    end
-
-    value = tostring(value)
-    for _, v in ipairs(table.pack(...)) do
-        -- escape '-'
-        v = tostring(v)
-        if value == v or value:find("^" .. v:gsub("%-", "%%-") .. "$") then
-            return true
-        end
-    end
-    return false
-end
-
 -- dump the configure
 function config.dump()
     if not option.get("quiet") then
diff --git a/xmake/core/project/project.lua b/xmake/core/project/project.lua
index 57655ee0e5..b102f44239 100644
--- a/xmake/core/project/project.lua
+++ b/xmake/core/project/project.lua
@@ -108,7 +108,12 @@ end
 
 -- the current config is belong to the given config values?
 function project._api_is_config(interp, name, ...)
-    return config.is_value(name, ...)
+    local value = config.get(name)
+    local namespace = interp:namespace()
+    if value == nil and namespace then
+        value = config.get(namespace .. "::" .. name)
+    end
+    return config._is_value(value, ...)
 end
 
 -- some configs are enabled?
diff --git a/xmake/core/sandbox/modules/is_config.lua b/xmake/core/sandbox/modules/is_config.lua
index 017f707f4e..9cc4ec18b8 100644
--- a/xmake/core/sandbox/modules/is_config.lua
+++ b/xmake/core/sandbox/modules/is_config.lua
@@ -18,6 +18,19 @@
 -- @file        is_config.lua
 --
 
--- return module
-return require("project/config").is_value
+local config  = require("project/config")
+local sandbox = require("sandbox/sandbox")
+
+return function (name, ...)
+    local namespace
+    local instance = sandbox.instance()
+    if instance then
+        namespace = instance:namespace()
+    end
+    local value = config.get(name)
+    if value == nil and namespace then
+        value = config.get(namespace .. "::" .. name)
+    end
+    return config._is_value(value, ...)
+end