diff --git a/src/ui.c b/src/ui.c
index 4fe9003d..32fc07b8 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -149,7 +149,7 @@ void GetMainButtonsWidth(HWND hDlg)
 {
 	unsigned int i;
 	RECT rc;
-	LONG style;
+	LONG_PTR style;
 	char download[64];
 
 	GetWindowRect(GetDlgItem(hDlg, main_button_ids[0]), &rc);
@@ -167,9 +167,9 @@ void GetMainButtonsWidth(HWND hDlg)
 		static_strcpy(download, lmprintf(MSG_040));
 		CharUpperBuffU(download, sizeof(download));
 		bw = max(bw, GetTextSize(GetDlgItem(hDlg, IDC_SELECT), download).cx + (3 * cbw) / 2);
-		style = GetWindowLong(GetDlgItem(hDlg, IDC_SELECT), GWL_STYLE);
-		style|= BS_SPLITBUTTON;
-		SetWindowLong(GetDlgItem(hDlg, IDC_SELECT), GWL_STYLE, style);
+		style = GetWindowLongPtr(GetDlgItem(hDlg, IDC_SELECT), GWL_STYLE);
+		style |= BS_SPLITBUTTON;
+		SetWindowLongPtr(GetDlgItem(hDlg, IDC_SELECT), GWL_STYLE, style);
 	}
 }