diff --git a/desmume/src/frontend/windows/memView.cpp b/desmume/src/frontend/windows/memView.cpp
index 0fe65c7d7..670f0c51c 100644
--- a/desmume/src/frontend/windows/memView.cpp
+++ b/desmume/src/frontend/windows/memView.cpp
@@ -301,8 +301,8 @@ INT_PTR CALLBACK MemView_DlgProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lPa
 	case WM_INITDIALOG:
 		{
 			wnd = (CMemView*)lParam;
-			SetWindowLongPtr(hDlg, DWLP_USER, (LONG)wnd);
-			SetWindowLongPtr(GetDlgItem(hDlg, IDC_MEMVIEWBOX), DWLP_USER, (LONG)wnd);
+			SetWindowLongPtr(hDlg, DWLP_USER, (LONG_PTR)wnd);
+			SetWindowLongPtr(GetDlgItem(hDlg, IDC_MEMVIEWBOX), DWLP_USER, (LONG_PTR)wnd);
 
 			wnd->font = CreateFont(16, 0, 0, 0, FW_MEDIUM, FALSE, FALSE, FALSE, DEFAULT_CHARSET, 
 				OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, GetFontQuality(), FIXED_PITCH, "Courier New");