diff --git a/adapters/logrus/logrus.go b/adapters/logrus/logrus.go
index 01c3035..034ea76 100644
--- a/adapters/logrus/logrus.go
+++ b/adapters/logrus/logrus.go
@@ -8,8 +8,10 @@ import (
 	"go.arsenm.dev/logger"
 )
 
-var _ logger.Logger = &LogrusLogger{}
-var _ logger.LogBuilder = &LogrusLogBuilder{}
+var (
+	_ logger.Logger     = &LogrusLogger{}
+	_ logger.LogBuilder = &LogrusLogBuilder{}
+)
 
 type LogrusLogger struct {
 	logger *logrus.Logger
diff --git a/adapters/zap/zap.go b/adapters/zap/zap.go
index 17c20d4..f9b3664 100644
--- a/adapters/zap/zap.go
+++ b/adapters/zap/zap.go
@@ -9,8 +9,10 @@ import (
 	"go.uber.org/zap/zapcore"
 )
 
-var _ logger.Logger = &ZapLogger{}
-var _ logger.LogBuilder = &ZapLogBuilder{}
+var (
+	_ logger.Logger     = &ZapLogger{}
+	_ logger.LogBuilder = &ZapLogBuilder{}
+)
 
 type ZapLogger struct {
 	Logger *zap.Logger
diff --git a/adapters/zerolog/zerolog.go b/adapters/zerolog/zerolog.go
index 401b60d..4d6f50e 100644
--- a/adapters/zerolog/zerolog.go
+++ b/adapters/zerolog/zerolog.go
@@ -8,8 +8,10 @@ import (
 	"go.arsenm.dev/logger"
 )
 
-var _ logger.Logger = &ZerologLogger{}
-var _ logger.LogBuilder = &ZerologLogBuilder{}
+var (
+	_ logger.Logger     = &ZerologLogger{}
+	_ logger.LogBuilder = &ZerologLogBuilder{}
+)
 
 type ZerologLogger struct {
 	logger zerolog.Logger
diff --git a/logger_test.go b/logger_test.go
index 504a24e..6213dbe 100644
--- a/logger_test.go
+++ b/logger_test.go
@@ -12,9 +12,11 @@ import (
 	"go.arsenm.dev/logger"
 )
 
-var buf = &bytes.Buffer{}
-var jsonlog = logger.NewJSON(buf)
-var prettylog = logger.NewPretty(buf)
+var (
+	buf       = &bytes.Buffer{}
+	jsonlog   = logger.NewJSON(buf)
+	prettylog = logger.NewPretty(buf)
+)
 
 func TestJSON(t *testing.T) {
 	t.Run("empty", func(t *testing.T) {