diff --git a/src/user/Application.sol b/src/user/Application.sol
index 8beef4e..1d2ec7e 100644
--- a/src/user/Application.sol
+++ b/src/user/Application.sol
@@ -27,11 +27,11 @@ abstract contract Application is AppBase {
         ORMP = ormp;
     }
 
-    function ormpSender() public view override returns (address) {
+    function ormpSender() public view virtual override returns (address) {
         return ORMP;
     }
 
-    function ormpRecver() public view override returns (address) {
+    function ormpRecver() public view virtual override returns (address) {
         return ORMP;
     }
 
diff --git a/src/user/UpgradeableApplication.sol b/src/user/UpgradeableApplication.sol
index 0c78b1c..d8f1598 100644
--- a/src/user/UpgradeableApplication.sol
+++ b/src/user/UpgradeableApplication.sol
@@ -32,11 +32,11 @@ abstract contract UpgradeableApplication is AppBase {
         recver = ormp;
     }
 
-    function ormpSender() public view override returns (address) {
+    function ormpSender() public view virtual override returns (address) {
         return sender;
     }
 
-    function ormpRecver() public view override returns (address) {
+    function ormpRecver() public view virtual override returns (address) {
         return recver;
     }