diff --git a/reactos/base/system/winlogon/sas.c b/reactos/base/system/winlogon/sas.c
index b68c97640eb..898aa311079 100644
--- a/reactos/base/system/winlogon/sas.c
+++ b/reactos/base/system/winlogon/sas.c
@@ -505,7 +505,7 @@ HandleLogoff(
 	return STATUS_SUCCESS;
 }
 
-static LRESULT CALLBACK
+static INT_PTR CALLBACK
 ShutdownComputerWindowProc(
 	IN HWND hwndDlg,
 	IN UINT uMsg,
diff --git a/reactos/base/system/winlogon/winlogon.c b/reactos/base/system/winlogon/winlogon.c
index 454154acf06..7c9a79e7c26 100644
--- a/reactos/base/system/winlogon/winlogon.c
+++ b/reactos/base/system/winlogon/winlogon.c
@@ -185,7 +185,7 @@ RemoveStatusMessage(
 	return Session->Gina.Functions.WlxRemoveStatusMessage(Session->Gina.Context);
 }
 
-static LRESULT CALLBACK
+static INT_PTR CALLBACK
 GinaLoadFailedWindowProc(
 	IN HWND hwndDlg,
 	IN UINT uMsg,
diff --git a/reactos/base/system/winlogon/wlx.c b/reactos/base/system/winlogon/wlx.c
index fc7c4782547..fa32b5a5e20 100644
--- a/reactos/base/system/winlogon/wlx.c
+++ b/reactos/base/system/winlogon/wlx.c
@@ -23,7 +23,7 @@ static UINT_PTR IdTimer;
 
 /* FUNCTIONS ****************************************************************/
 
-static LRESULT CALLBACK
+static INT_PTR CALLBACK
 DefaultWlxWindowProc(
 	IN HWND hwndDlg,
 	IN UINT uMsg,