diff --git a/networking/ntpd.c b/networking/ntpd.c
index c4b018778..f1f99bb2b 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -1328,7 +1328,9 @@ update_local_clock(peer_t *p)
 #if !USING_KERNEL_PLL_LOOP
 	double freq_drift;
 #endif
+#if !USING_KERNEL_PLL_LOOP || USING_INITIAL_FREQ_ESTIMATION
 	double since_last_update;
+#endif
 	double etemp, dtemp;
 
 	abs_offset = fabs(offset);
@@ -1356,7 +1358,9 @@ update_local_clock(peer_t *p)
 	 * action is and defines how the system reacts to large time
 	 * and frequency errors.
 	 */
+#if !USING_KERNEL_PLL_LOOP || USING_INITIAL_FREQ_ESTIMATION
 	since_last_update = recv_time - G.reftime;
+#endif
 #if !USING_KERNEL_PLL_LOOP
 	freq_drift = 0;
 #endif