diff --git a/ntp_core.c b/ntp_core.c
index d2ba6d8..39dc02f 100644
--- a/ntp_core.c
+++ b/ntp_core.c
@@ -932,7 +932,8 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
      round trip delay to the minimum one currently in the stats data
      register is less than an administrator-defined value */
 
-  if (fabs(delta/SRC_MinRoundTripDelay(inst->source)) > inst->max_delay_ratio) {
+  if (inst->max_delay_ratio > 1.0 &&
+      fabs(delta/SRC_MinRoundTripDelay(inst->source)) > inst->max_delay_ratio) {
     test4b = 0; /* Failed */
   } else {
     test4b = 1; /* Success */
diff --git a/srcparams.h b/srcparams.h
index 19eadcf..4e01d3b 100644
--- a/srcparams.h
+++ b/srcparams.h
@@ -50,7 +50,7 @@ typedef struct {
 #define SRC_DEFAULT_MAXPOLL 10
 #define SRC_DEFAULT_PRESEND_MINPOLL 0
 #define SRC_DEFAULT_MAXDELAY 16.0
-#define SRC_DEFAULT_MAXDELAYRATIO 16384.0
+#define SRC_DEFAULT_MAXDELAYRATIO 0.0
 #define SRC_DEFAULT_MAXDELAYDEVRATIO 10.0
 #define SRC_DEFAULT_MINSTRATUM 0
 #define SRC_DEFAULT_POLLTARGET 6