diff --git a/pkg/obiformats/fastseq_obi_header.go b/pkg/obiformats/fastseq_obi_header.go
index 173d78f..8ee1725 100644
--- a/pkg/obiformats/fastseq_obi_header.go
+++ b/pkg/obiformats/fastseq_obi_header.go
@@ -298,27 +298,29 @@ func FormatFastSeqOBIHeader(sequence *obiseq.BioSequence) string {
 		var text strings.Builder
 
 		for key, value := range annotations {
-			switch t := value.(type) {
-			case string:
-				text.WriteString(fmt.Sprintf("%s=%s; ", key, t))
-			case map[string]int,
-				map[string]string,
-				map[string]interface{},
-				obiseq.StatsOnValues:
-				tv, err := obiutils.JsonMarshal(t)
-				if err != nil {
-					log.Fatalf("Cannot convert %v value", value)
+			if key != "definition" {
+				switch t := value.(type) {
+				case string:
+					text.WriteString(fmt.Sprintf("%s=%s; ", key, t))
+				case map[string]int,
+					map[string]string,
+					map[string]interface{},
+					obiseq.StatsOnValues:
+					tv, err := obiutils.JsonMarshal(t)
+					if err != nil {
+						log.Fatalf("Cannot convert %v value", value)
+					}
+					tv = bytes.ReplaceAll(tv, []byte(`"`), []byte("'"))
+					text.WriteString(fmt.Sprintf("%s=", key))
+					text.Write(tv)
+					text.WriteString("; ")
+				default:
+					text.WriteString(fmt.Sprintf("%s=%v; ", key, value))
 				}
-				tv = bytes.ReplaceAll(tv, []byte(`"`), []byte("'"))
-				text.WriteString(fmt.Sprintf("%s=", key))
-				text.Write(tv)
-				text.WriteString("; ")
-			default:
-				text.WriteString(fmt.Sprintf("%s=%v; ", key, value))
 			}
 		}
 
-		return text.String()
+		return text.String() + " " + sequence.Definition()
 	}
 
 	return ""
diff --git a/pkg/obiformats/fastseq_write_fasta.go b/pkg/obiformats/fastseq_write_fasta.go
index 8e4b44e..5b48a97 100644
--- a/pkg/obiformats/fastseq_write_fasta.go
+++ b/pkg/obiformats/fastseq_write_fasta.go
@@ -63,9 +63,8 @@ func FormatFasta(seq *obiseq.BioSequence, formater FormatHeader) string {
 	}
 
 	info := formater(seq)
-	return fmt.Sprintf(">%s %s %s\n%s",
+	return fmt.Sprintf(">%s %s\n%s",
 		seq.Id(), info,
-		seq.Definition(),
 		folded)
 }
 
@@ -199,7 +198,7 @@ func WriteFasta(iterator obiiter.IBioSequence,
 // configuration options as variadic arguments. It appends the option to not close the file
 // to the options slice and then calls the WriteFasta function passing the iterator,
 // os.Stdout as the output file, and the options slice.
-// 
+//
 // The function returns the same bio sequence iterator and an error if any occurred.
 func WriteFastaToStdout(iterator obiiter.IBioSequence,
 	options ...WithOption) (obiiter.IBioSequence, error) {
diff --git a/pkg/obiformats/fastseq_write_fastq.go b/pkg/obiformats/fastseq_write_fastq.go
index d3c6774..7d4ddd4 100644
--- a/pkg/obiformats/fastseq_write_fastq.go
+++ b/pkg/obiformats/fastseq_write_fastq.go
@@ -32,9 +32,8 @@ func FormatFastq(seq *obiseq.BioSequence, quality_shift int, formater FormatHead
 		info = formater(seq)
 	}
 
-	return fmt.Sprintf("@%s %s %s\n%s\n+\n%s",
+	return fmt.Sprintf("@%s %s\n%s\n+\n%s",
 		seq.Id(), info,
-		seq.Definition(),
 		string(seq.Sequence()),
 		string(ascii),
 	)
diff --git a/pkg/obiformats/xopen.go b/pkg/obiformats/xopen.go
index a74140f..8a0c093 100644
--- a/pkg/obiformats/xopen.go
+++ b/pkg/obiformats/xopen.go
@@ -403,7 +403,7 @@ func WopenFile(f string, flag int, perm os.FileMode) (*Writer, error) {
 	if strings.HasSuffix(f2, ".gz") {
 		gz, err := gzip.NewWriterLevel(wtr, Level)
 		if err != nil {
-			err = errors.New(fmt.Sprintf("xopen: %s", err))
+			err = fmt.Errorf("xopen: %s", err)
 		}
 		return &Writer{bufio.NewWriterSize(gz, bufSize), wtr, gz, nil, nil, nil}, err
 	}
@@ -418,7 +418,7 @@ func WopenFile(f string, flag int, perm os.FileMode) (*Writer, error) {
 		}
 		zw, err := zstd.NewWriter(wtr, zstd.WithEncoderLevel(zstd.EncoderLevel(level)))
 		if err != nil {
-			err = errors.New(fmt.Sprintf("xopen: zstd: %s", err))
+			err = fmt.Errorf("xopen: zstd: %s", err)
 		}
 		return &Writer{bufio.NewWriterSize(zw, bufSize), wtr, nil, nil, zw, nil}, err
 	}
@@ -429,7 +429,7 @@ func WopenFile(f string, flag int, perm os.FileMode) (*Writer, error) {
 		}
 		bz2, err := bzip2.NewWriter(wtr, &bzip2.WriterConfig{Level: level})
 		if err != nil {
-			err = errors.New(fmt.Sprintf("xopen: %s", err))
+			err = fmt.Errorf("xopen: %s", err)
 		}
 		return &Writer{bufio.NewWriterSize(bz2, bufSize), wtr, nil, nil, nil, bz2}, err
 	}
diff --git a/pkg/obiformats/xopen_test.go b/pkg/obiformats/xopen_test.go
index b40ec11..8146f36 100644
--- a/pkg/obiformats/xopen_test.go
+++ b/pkg/obiformats/xopen_test.go
@@ -61,7 +61,7 @@ func (s *XopenTest) TestWopen(c *C) {
 		_, err = os.Stat(f)
 		c.Assert(err, IsNil)
 		c.Assert(wtr.wtr, NotNil)
-		fmt.Fprintf(wtr, testString)
+		fmt.Fprint(wtr, testString)
 		wtr.Close()
 
 		rdr, err := Ropen(f)
@@ -70,7 +70,7 @@ func (s *XopenTest) TestWopen(c *C) {
 		str, err := rdr.ReadString(99)
 		c.Assert(str, Equals, testString)
 		c.Assert(err, Equals, io.EOF)
-		str, err = rdr.ReadString(99)
+		str, _ = rdr.ReadString(99)
 		c.Assert(str, Equals, "")
 
 		rdr.Close()