diff --git a/src/main/java/xyz/zhouxy/plusone/commons/exception/IWithCode.java b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithCode.java
similarity index 95%
rename from src/main/java/xyz/zhouxy/plusone/commons/exception/IWithCode.java
rename to src/main/java/xyz/zhouxy/plusone/commons/base/IWithCode.java
index 3deeae8..5c1ecbc 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/exception/IWithCode.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithCode.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package xyz.zhouxy.plusone.commons.exception;
+package xyz.zhouxy.plusone.commons.base;
 
 import javax.annotation.Nonnull;
 
diff --git a/src/main/java/xyz/zhouxy/plusone/commons/exception/IWithIntCode.java b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithIntCode.java
similarity index 90%
rename from src/main/java/xyz/zhouxy/plusone/commons/exception/IWithIntCode.java
rename to src/main/java/xyz/zhouxy/plusone/commons/base/IWithIntCode.java
index a2258f8..480ab75 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/exception/IWithIntCode.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/base/IWithIntCode.java
@@ -14,7 +14,9 @@
  * limitations under the License.
  */
 
-package xyz.zhouxy.plusone.commons.exception;
+package xyz.zhouxy.plusone.commons.base;
+
+import xyz.zhouxy.plusone.commons.exception.BaseException;
 
 /**
  * 规定实现类带有 {@code getCode} 方法。
diff --git a/src/main/java/xyz/zhouxy/plusone/commons/exception/BaseException.java b/src/main/java/xyz/zhouxy/plusone/commons/exception/BaseException.java
index 33390ab..27bc36e 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/exception/BaseException.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/exception/BaseException.java
@@ -16,6 +16,8 @@
 
 package xyz.zhouxy.plusone.commons.exception;
 
+import xyz.zhouxy.plusone.commons.base.IWithIntCode;
+
 /**
  * 带错误码的异常。
  *