diff --git a/bin/tests/system/dlzexternal/Makefile.in b/bin/tests/system/dlzexternal/Makefile.in
index 08cfed6f72..2a1a6d1434 100644
--- a/bin/tests/system/dlzexternal/Makefile.in
+++ b/bin/tests/system/dlzexternal/Makefile.in
@@ -33,13 +33,8 @@ OBJS =
 CFLAGS =	@CFLAGS@ @SO_CFLAGS@
 SO_LDFLAGS =	@LDFLAGS@ @SO_LDFLAGS@
 
-ISCLIBS =	../../../../lib/isc/libisc.@A@
-SO_STRIP =	@SO_STRIP@
-
-driver.@SO@: ${SO_OBJS} ${ISCLIBS}
-	CLEANED=`echo "${ISCLIBS} ${LIBS}" | ${SO_STRIP}`; \
-	${LIBTOOL_MODE_LINK} @SO_LD@ ${SO_LDFLAGS} -o $@ ${SO_OBJS} \
-		$${CLEANED}
+driver.@SO@: ${SO_OBJS}
+	${LIBTOOL_MODE_LINK} @SO_LD@ ${SO_LDFLAGS} -o $@ driver.@O@
 
 clean distclean::
 	rm -f ${TARGETS}
diff --git a/bin/tests/system/dlzexternal/driver.c b/bin/tests/system/dlzexternal/driver.c
index 79ce22909f..5377c9c8dc 100644
--- a/bin/tests/system/dlzexternal/driver.c
+++ b/bin/tests/system/dlzexternal/driver.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011-2017  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2011-2016  Internet Systems Consortium, Inc. ("ISC")
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -231,7 +231,6 @@ dlz_create(const char *dlzname, unsigned int argc, char *argv[],
 	char soa_data[1024];
 	const char *extra;
 	isc_result_t result;
-	size_t znsize;
 	int n;
 
 	UNUSED(dlzname);
@@ -256,17 +255,15 @@ dlz_create(const char *dlzname, unsigned int argc, char *argv[],
 	}
 
 	/* Ensure zone name is absolute */
-	znsize = strlen(argv[1]) + 2;
-	state->zone_name = malloc(znsize);
+	state->zone_name = malloc(strlen(argv[1]) + 2);
 	if (state->zone_name == NULL) {
 		free(state);
 		return (ISC_R_NOMEMORY);
 	}
-	if (argv[1][strlen(argv[1]) - 1] == '.') {
-		strlcpy(state->zone_name, argv[1], znsize);
-	} else {
-		snprintf(state->zone_name, znsize, "%s.", argv[1]);
-	}
+	if (argv[1][strlen(argv[1]) - 1] == '.')
+		strcpy(state->zone_name, argv[1]);
+	else
+		sprintf(state->zone_name, "%s.", argv[1]);
 
 	if (strcmp(state->zone_name, ".") == 0)
 		extra = ".root";
@@ -329,7 +326,7 @@ dlz_findzonedb(void *dbdata, const char *name,
 	char addrbuf[100];
 	char absolute[1024];
 
-	strlcpy(addrbuf, "unknown", sizeof(addrbuf));
+	strcpy(addrbuf, "unknown");
 	if (methods != NULL &&
 	    methods->sourceip != NULL &&
 	    methods->version - methods->age <= DNS_CLIENTINFOMETHODS_VERSION &&
@@ -458,7 +455,7 @@ dlz_lookup(const char *zone, const char *name, void *dbdata,
 	}
 
 	if (strcmp(name, "source-addr") == 0) {
-		strlcpy(buf, "unknown", sizeof(buf));
+		strcpy(buf, "unknown");
 		if (methods != NULL &&
 		    methods->sourceip != NULL &&
 		    (methods->version - methods->age <=