diff --git a/config.h.W32.template b/config.h.W32.template
index 853881b4..2b50e4c4 100644
--- a/config.h.W32.template
+++ b/config.h.W32.template
@@ -426,8 +426,12 @@ this program.  If not, see <http://www.gnu.org/licenses/>.  */
 /* Define to `int' if <sys/types.h> does not define. */
 /* GCC 4.x reportedly defines pid_t.  */
 #ifndef _PID_T_
+#ifdef _WIN64
+#define pid_t __int64
+#else
 #define pid_t int
 #endif
+#endif
 
 /* Define to `int' if <sys/types.h> doesn't define. */
 #define uid_t int