diff --git a/src/seqio.h b/src/seqio.h
index 1aae09f..819bf19 100644
--- a/src/seqio.h
+++ b/src/seqio.h
@@ -33,6 +33,10 @@ namespace klibpp {
       SeqStreamIn( const char* filename )
         : base_type( gzopen( filename, "r" ), gzread, gzclose )
       { }
+
+      SeqStreamIn( int fd )
+        : base_type( gzdopen( fd, "r" ), gzread, gzclose )
+      { }
   };
 
   class SeqStreamOut
@@ -44,6 +48,10 @@ namespace klibpp {
       SeqStreamOut( const char* filename, bool compressed=false )
         : base_type( gzopen( filename, ( compressed ? "w" : "wT" ) ), gzwrite, gzclose )
       { }
+
+      SeqStreamOut( int fd, bool compressed=false )
+        : base_type( gzdopen( fd, ( compressed ? "w" : "wT" ) ), gzwrite, gzclose )
+      { }
   };
 }  /* -----  end of namespace klibpp  ----- */
 #endif  /* ----- #ifndef SEQIO_H__  ----- */