diff --git a/challenge/dns01/dns_challenge_manual.go b/challenge/dns01/dns_challenge_manual.go
index 490108dd..85da7d0e 100644
--- a/challenge/dns01/dns_challenge_manual.go
+++ b/challenge/dns01/dns_challenge_manual.go
@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"fmt"
 	"os"
+	"time"
 )
 
 const (
@@ -50,3 +51,9 @@ func (*DNSProviderManual) CleanUp(domain, token, keyAuth string) error {
 
 	return nil
 }
+
+// Sequential All DNS challenges for this provider will be resolved sequentially.
+// Returns the interval between each iteration.
+func (d *DNSProviderManual) Sequential() time.Duration {
+	return DefaultPropagationTimeout
+}