diff --git a/lib/dns/rdata/generic/brid_68.c b/lib/dns/rdata/generic/brid_68.c
index 316a822cd3..2b772d7e21 100644
--- a/lib/dns/rdata/generic/brid_68.c
+++ b/lib/dns/rdata/generic/brid_68.c
@@ -28,7 +28,7 @@ fromtext_brid(ARGS_FROMTEXT) {
 	UNUSED(options);
 	UNUSED(callbacks);
 
-	return isc_base64_tobuffer(lexer, target, -1);
+	return isc_base64_tobuffer(lexer, target, -2);
 }
 
 static isc_result_t
diff --git a/lib/dns/rdata/generic/hhit_67.c b/lib/dns/rdata/generic/hhit_67.c
index b66e1a7386..68d60a762d 100644
--- a/lib/dns/rdata/generic/hhit_67.c
+++ b/lib/dns/rdata/generic/hhit_67.c
@@ -28,7 +28,7 @@ fromtext_hhit(ARGS_FROMTEXT) {
 	UNUSED(options);
 	UNUSED(callbacks);
 
-	return isc_base64_tobuffer(lexer, target, -1);
+	return isc_base64_tobuffer(lexer, target, -2);
 }
 
 static isc_result_t