diff --git a/.gitignore b/.gitignore
index 3a5565e..3e59bb2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,3 +47,4 @@
 /src/Release_DLL
 /app/Tester/Debug
 /Debug
+/app/Tester/x64/Debug
diff --git a/src/NotificationRequestPool.cpp b/src/NotificationRequestPool.cpp
index 89c9b08..b7b2eba 100644
--- a/src/NotificationRequestPool.cpp
+++ b/src/NotificationRequestPool.cpp
@@ -37,7 +37,6 @@ NotificationRequestPool::NotificationRequestPool(
 ) :
     client_(client),
     target_(target),
-    callback_(callback),
     stop_(false)
 {
     // prepare array of handles and request wrappers
diff --git a/src/NotificationRequestPool.h b/src/NotificationRequestPool.h
index 19fd7bf..d43b216 100644
--- a/src/NotificationRequestPool.h
+++ b/src/NotificationRequestPool.h
@@ -41,7 +41,6 @@ class NotificationRequestPool
 
     PVIGEM_CLIENT client_;
     PVIGEM_TARGET target_;
-    FARPROC callback_;
 
     std::vector<std::unique_ptr<XusbNotificationRequest>> requests_;
     std::shared_ptr<boost::thread> thread_;