diff --git a/test/bench.c b/test/bench.c
index e51b12a9..fde7d4ac 100644
--- a/test/bench.c
+++ b/test/bench.c
@@ -63,12 +63,16 @@ static int *pipes;
 static int num_pipes, num_active, num_writes;
 static struct event *events;
 
-
+#if SIZEOF_VOID_P == 4
+#define EV_INTPTR_T ev_int32_t
+#elif SIZEOF_VOID_P == 8
+#define EV_INTPTR_T ev_int64_t
+#endif
 
 static void
 read_cb(int fd, short which, void *arg)
 {
-	int idx = (int) arg, widx = idx + 1;
+	EV_INTPTR_T idx = (ev_uint64_t) arg, widx = idx + 1;
 	u_char ch;
 
 	count += read(fd, &ch, sizeof(ch));
@@ -84,7 +88,8 @@ read_cb(int fd, short which, void *arg)
 static struct timeval *
 run_once(void)
 {
-	int *cp, i, space;
+	int *cp, space;
+	EV_INTPTR_T i;
 	static struct timeval ts, te;
 
 	for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {