diff --git a/ospfd/ospf_spf.c b/ospfd/ospf_spf.c
index 7228d2d..a133d5f 100644
--- a/ospfd/ospf_spf.c
+++ b/ospfd/ospf_spf.c
@@ -1136,7 +1136,7 @@
   /* Increment SPF Calculation Counter. */
   area->spf_calculation++;
 
-  gettimeofday (&area->ospf->ts_spf, NULL);
+  quagga_gettime (QUAGGA_CLK_MONOTONIC, &area->ospf->ts_spf);
 
   if (IS_DEBUG_OSPF_EVENT)
     zlog_debug ("ospf_spf_calculate: Stop. %ld vertices",
@@ -1243,7 +1243,7 @@
     }
   
   /* XXX Monotic timers: we only care about relative time here. */
-  result = tv_sub (recent_time, ospf->ts_spf);
+  result = tv_sub (recent_relative_time (), ospf->ts_spf);
   
   elapsed = (result.tv_sec * 1000) + (result.tv_usec / 1000);
   ht = ospf->spf_holdtime * ospf->spf_hold_multiplier;