diff --git a/windows/winpgnt.c b/windows/winpgnt.c
index 2d6917c2..fa4d1d10 100644
--- a/windows/winpgnt.c
+++ b/windows/winpgnt.c
@@ -789,7 +789,7 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
       case WM_SYSCOMMAND:
 	switch (wParam & ~0xF) {       /* low 4 bits reserved to Windows */
 	  case IDM_PUTTY:
-	    if((int)ShellExecute(hwnd, NULL, putty_path, _T(""), _T(""),
+	    if((INT_PTR)ShellExecute(hwnd, NULL, putty_path, _T(""), _T(""),
 				 SW_SHOW) <= 32) {
 		MessageBox(NULL, "Unable to execute PuTTY!",
 			   "Error", MB_OK | MB_ICONERROR);
@@ -856,7 +856,7 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
 		    GetMenuItemInfo(session_menu, wParam, FALSE, &mii);
 		    strcpy(param, "@");
 		    strcat(param, mii.dwTypeData);
-		    if((int)ShellExecute(hwnd, NULL, putty_path, param,
+		    if((INT_PTR)ShellExecute(hwnd, NULL, putty_path, param,
 					 _T(""), SW_SHOW) <= 32) {
 			MessageBox(NULL, "Unable to execute PuTTY!", "Error",
 				   MB_OK | MB_ICONERROR);