--- a/htpdate.c
+++ b/htpdate.c
@@ -349,7 +349,7 @@
 
 	/* Read current kernel frequency */
 	tmx.modes = 0;
-	ntp_adjtime(&tmx);
+	adjtimex(&tmx);
 
 	/* Calculate new frequency */
 	freq = (long)(65536e6 * drift);
@@ -364,7 +364,7 @@
 
 	/* Become root */
 	seteuid(0);
-	return( ntp_adjtime(&tmx) );
+	return( adjtimex(&tmx) );
 }