diff --git a/hw/m48t59.c b/hw/m48t59.c
index c2c0decc8e..da61313f1e 100644
--- a/hw/m48t59.c
+++ b/hw/m48t59.c
@@ -161,10 +161,9 @@ static void set_alarm (m48t59_t *NVRAM, struct tm *tm)
     NVRAM->alarm = mktime(tm);
     if (NVRAM->alrm_timer != NULL) {
         qemu_del_timer(NVRAM->alrm_timer);
-	NVRAM->alrm_timer = NULL;
+        if (NVRAM->alarm - time(NULL) > 0)
+            qemu_mod_timer(NVRAM->alrm_timer, NVRAM->alarm * 1000);
     }
-    if (NVRAM->alarm - time(NULL) > 0)
-	qemu_mod_timer(NVRAM->alrm_timer, NVRAM->alarm * 1000);
 }
 
 /* Watchdog management */
@@ -188,15 +187,14 @@ static void set_up_watchdog (m48t59_t *NVRAM, uint8_t value)
 {
     uint64_t interval; /* in 1/16 seconds */
 
+    NVRAM->buffer[0x1FF0] &= ~0x80;
     if (NVRAM->wd_timer != NULL) {
         qemu_del_timer(NVRAM->wd_timer);
-	NVRAM->wd_timer = NULL;
-    }
-    NVRAM->buffer[0x1FF0] &= ~0x80;
-    if (value != 0) {
-	interval = (1 << (2 * (value & 0x03))) * ((value >> 2) & 0x1F);
-	qemu_mod_timer(NVRAM->wd_timer, ((uint64_t)time(NULL) * 1000) +
-		       ((interval * 1000) >> 4));
+        if (value != 0) {
+            interval = (1 << (2 * (value & 0x03))) * ((value >> 2) & 0x1F);
+            qemu_mod_timer(NVRAM->wd_timer, ((uint64_t)time(NULL) * 1000) +
+                           ((interval * 1000) >> 4));
+        }
     }
 }