diff --git a/internal/testutil/syn.go b/internal/testutil/syn.go
index ae53d57..863b59a 100644
--- a/internal/testutil/syn.go
+++ b/internal/testutil/syn.go
@@ -16,8 +16,6 @@ package testutil
 
 import (
 	"encoding/binary"
-	"fmt"
-	"math"
 	"testing"
 
 	"github.com/ianlewis/go-stardict/syn"
@@ -31,18 +29,14 @@ func MakeSyn(t *testing.T, words []*syn.Word) []byte {
 	for _, w := range words {
 		// Allow for zero byte terminator and 4 extra bytes for the word index.
 		bWord := make([]byte, len(w.Word)+5)
-		copy(bWord, []byte(w.Word))
+		copy(bWord, w.Word)
 		i := len(w.Word)
 		// NOTE: byte array entries are already initialized to zero but we set
 		// it anyway for clarity.
 		bWord[i] = 0
 		i++
 
-		if w.OriginalWordIndex > math.MaxUint32 {
-			panic(fmt.Sprintf("index too large: %d", w.OriginalWordIndex))
-		}
-		//nolint:gosec // test code, offset size determined by idxoffsetbits
-		binary.BigEndian.PutUint32(bWord[i:], uint32(w.OriginalWordIndex))
+		binary.BigEndian.PutUint32(bWord[i:], w.OriginalWordIndex)
 		b = append(b, bWord...)
 	}
 	return b
diff --git a/stardict_test.go b/stardict_test.go
index 68be8d3..627e499 100644
--- a/stardict_test.go
+++ b/stardict_test.go
@@ -128,6 +128,8 @@ idxfilesize=6`,
 }
 
 func TestSearch(t *testing.T) {
+	t.Parallel()
+
 	tests := []struct {
 		name  string
 		dict  *testDict
diff --git a/syn/syn.go b/syn/syn.go
index 95b29e9..02f599f 100644
--- a/syn/syn.go
+++ b/syn/syn.go
@@ -24,11 +24,12 @@ import (
 	"strings"
 	"unicode"
 
-	"github.com/ianlewis/go-stardict/internal/folding"
 	"golang.org/x/text/cases"
 	"golang.org/x/text/runes"
 	"golang.org/x/text/transform"
 	"golang.org/x/text/unicode/norm"
+
+	"github.com/ianlewis/go-stardict/internal/folding"
 )
 
 // Word is a .syn file entry.
diff --git a/syn/syn_test.go b/syn/syn_test.go
index 5367a23..3024378 100644
--- a/syn/syn_test.go
+++ b/syn/syn_test.go
@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
+
 	"github.com/ianlewis/go-stardict/internal/testutil"
 	"github.com/ianlewis/go-stardict/syn"
 )