diff --git a/src/base/rdata.rs b/src/base/rdata.rs
index 7b9f1c6a7..ecb0a869a 100644
--- a/src/base/rdata.rs
+++ b/src/base/rdata.rs
@@ -404,7 +404,7 @@ impl<Octs: AsRef<[u8]>> RecordData for UnknownRecordData<Octs> {
     }
 }
 
-impl<'a, Octs: Octets> ParseRecordData<'a, Octs>
+impl<'a, Octs: Octets + ?Sized> ParseRecordData<'a, Octs>
     for UnknownRecordData<Octs::Range<'a>>
 {
     fn parse_rdata(
diff --git a/src/rdata/macros.rs b/src/rdata/macros.rs
index 9d145670c..018784b32 100644
--- a/src/rdata/macros.rs
+++ b/src/rdata/macros.rs
@@ -357,7 +357,7 @@ macro_rules! rdata_types {
             }
         }
 
-        impl<'a, Octs: octseq::octets::Octets>
+        impl<'a, Octs: octseq::octets::Octets + ?Sized>
         $crate::base::rdata::ParseRecordData<'a, Octs>
         for ZoneRecordData<Octs::Range<'a>, ParsedDname<Octs::Range<'a>>> {
             fn parse_rdata(