diff --git a/svcb.go b/svcb.go
index ec0a76f4..64800daa 100644
--- a/svcb.go
+++ b/svcb.go
@@ -511,8 +511,13 @@ func (s *SVCBIPv4Hint) parse(b string) error {
 }
 
 func (s *SVCBIPv4Hint) copy() SVCBKeyValue {
+	hint := make([]net.IP, len(s.Hint))
+	for i, ip := range s.Hint {
+		hint[i] = copyIP(ip)
+	}
+
 	return &SVCBIPv4Hint{
-		append([]net.IP(nil), s.Hint...),
+		Hint: hint,
 	}
 }
 
@@ -629,8 +634,13 @@ func (s *SVCBIPv6Hint) parse(b string) error {
 }
 
 func (s *SVCBIPv6Hint) copy() SVCBKeyValue {
+	hint := make([]net.IP, len(s.Hint))
+	for i, ip := range s.Hint {
+		hint[i] = copyIP(ip)
+	}
+
 	return &SVCBIPv6Hint{
-		append([]net.IP(nil), s.Hint...),
+		Hint: hint,
 	}
 }