diff --git a/slog/handler.go b/slog/handler.go
index 0cee928..5ab9fbf 100644
--- a/slog/handler.go
+++ b/slog/handler.go
@@ -181,7 +181,7 @@
 				buf.WriteString(file)
 				buf.WriteByte(':')
 				itoa((*[]byte)(buf), line, -1)
-				s := string(*buf)
+				s := buf.String()
 				buf.Free()
 				replace(String(key, s))
 			}
diff --git a/slog/internal/buffer/buffer.go b/slog/internal/buffer/buffer.go
index e059383..60e6646 100644
--- a/slog/internal/buffer/buffer.go
+++ b/slog/internal/buffer/buffer.go
@@ -44,3 +44,7 @@
 func (b *Buffer) WriteByte(c byte) {
 	*b = append(*b, c)
 }
+
+func (b *Buffer) String() string {
+	return string(*b)
+}
diff --git a/slog/internal/buffer/buffer_test.go b/slog/internal/buffer/buffer_test.go
index 4466140..dc3966d 100644
--- a/slog/internal/buffer/buffer_test.go
+++ b/slog/internal/buffer/buffer_test.go
@@ -12,7 +12,7 @@
 	b.WriteString("hello")
 	b.WriteByte(',')
 	b.Write([]byte(" world"))
-	got := string(*b)
+	got := b.String()
 	want := "hello, world"
 	if got != want {
 		t.Errorf("got %q, want %q", got, want)
diff --git a/slog/record_test.go b/slog/record_test.go
index e526d24..afbd142 100644
--- a/slog/record_test.go
+++ b/slog/record_test.go
@@ -132,7 +132,7 @@
 			buf.WriteString(file)
 			buf.WriteByte(':')
 			itoa((*[]byte)(buf), line, -1)
-			s := string(*buf)
+			s := buf.String()
 			buf.Free()
 			_ = s
 		}