diff --git a/plugins/spu2-x/src/PS2E-spu2.cpp b/plugins/spu2-x/src/PS2E-spu2.cpp
index 9bf4e15096..4fe428c1bd 100644
--- a/plugins/spu2-x/src/PS2E-spu2.cpp
+++ b/plugins/spu2-x/src/PS2E-spu2.cpp
@@ -390,7 +390,7 @@ EXPORT_C_(s32) SPU2init()
 extern bool debugDialogOpen;
 extern HWND hDebugDialog;
 
-static BOOL CALLBACK DebugProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
+static INT_PTR CALLBACK DebugProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
 {
 	int wmId;