diff --git a/journslog/handler_option.go b/journslog/handler_option.go
index 38478c2..f52ec05 100644
--- a/journslog/handler_option.go
+++ b/journslog/handler_option.go
@@ -81,11 +81,3 @@ func WithAttrsFromTime(attrsFromTime func(time.Time) []slog.Attr) HandlerOption
 		jh.attrsFromTime = attrsFromTime
 	}
 }
-
-// WithAttrsFromLevel supplies a function which can optionally map the given
-// log level onto zero or more attributes.
-func WithAttrsFromLevel(attrsFromLevel func(slog.Level) []slog.Attr) HandlerOption {
-	return func(jh *JournalHandler) {
-		jh.attrsFromLevel = attrsFromLevel
-	}
-}
diff --git a/journslog/journslog.go b/journslog/journslog.go
index ca71d9c..9185489 100644
--- a/journslog/journslog.go
+++ b/journslog/journslog.go
@@ -62,10 +62,6 @@ type JournalHandler struct {
 	// Time from an [slog.Record]. It may be nil.
 	attrsFromTime func(time.Time) []slog.Attr
 
-	// attrsFromLevel may return zero or more attributes to represent the
-	// log level. It may be nil.
-	attrsFromLevel func(slog.Level) []slog.Attr
-
 	// groups are the ordered group names added by WithGroup. We need to
 	// maintain the full list, not just a pre-rendered prefix string,
 	// because of the API of replaceAttr.
@@ -178,13 +174,6 @@ func (jh *JournalHandler) Handle(ctx context.Context, rec slog.Record) error {
 		}
 		addAttrs = append(addAttrs, jh.attrsFromContext(ctx)...)
 	}
-	if jh.attrsFromLevel != nil {
-		if addAttrs == nil {
-			addAttrs = attrPoolGet()
-			defer attrPoolPut(addAttrs)
-		}
-		addAttrs = append(addAttrs, jh.attrsFromLevel(rec.Level)...)
-	}
 
 	// 2 for journal.Conn.Entry (MESSAGE and PRIORITY),
 	// 3 for SRC_* (optional but we always allocate space)
diff --git a/journslog/journslog_test.go b/journslog/journslog_test.go
index 33c342b..53129b8 100644
--- a/journslog/journslog_test.go
+++ b/journslog/journslog_test.go
@@ -4,11 +4,7 @@ import (
 	"log/slog"
 	"net/http"
 	"path/filepath"
-	"strings"
 	"testing"
-	"testing/slogtest"
-	"time"
-	"uuid"
 
 	"src.lwithers.me.uk/go/journal"
 	"src.lwithers.me.uk/go/journal/testsink"
@@ -86,97 +82,3 @@ type slowValue string
 func (s slowValue) LogValue() slog.Value {
 	return slog.StringValue(string(s))
 }
-
-// TestSlog integrates with [testing/slogtest].
-func TestSlog(t *testing.T) {
-	tmpdir := t.TempDir()
-
-	attrsFromTime := func(t time.Time) []slog.Attr {
-		return []slog.Attr{
-			{
-				Key:   "TEST_TIME",
-				Value: slog.StringValue(t.Format(time.RFC3339Nano)),
-			},
-		}
-	}
-
-	attrsFromLevel := func(l slog.Level) []slog.Attr {
-		return []slog.Attr{
-			{
-				Key:   "TEST_LEVEL",
-				Value: slog.StringValue(l.String()),
-			},
-		}
-	}
-
-	// XXX: this relies on [slogtest.Run] executing its test cases
-	// completely sequentially
-	var curSink *testsink.Sink
-
-	newHandler := func(t *testing.T) slog.Handler {
-		sockpath := filepath.Join(tmpdir, uuid.New().String())
-		sink, err := testsink.New(sockpath)
-		if err != nil {
-			t.Fatalf("failed to create test sink: %v", err)
-		}
-
-		conn, err := journal.Connect(sockpath)
-		if err != nil {
-			sink.Stop()
-			t.Fatalf("failed to connect to test sink socket: %v", err)
-		}
-
-		h, err := NewHandler(WithConn(conn), WithAttrsFromTime(attrsFromTime), WithAttrsFromLevel(attrsFromLevel), WithHandlerOptions(slog.HandlerOptions{
-			Level: slog.LevelInfo,
-		}))
-		if err != nil {
-			sink.Stop()
-			t.Fatalf("failed to create handler: %v", err)
-		}
-
-		curSink = sink
-		return h
-	}
-
-	result := func(t *testing.T) map[string]any {
-		defer curSink.Stop()
-
-		m, err := curSink.Message(0)
-		if err != nil {
-			t.Fatalf("failed to fetch message from test sink: %v", err)
-		}
-
-		msg, attrs, err := m.Decode()
-		if err != nil {
-			t.Errorf("failed to decode message from test sink: %v", err)
-		}
-
-		out := make(map[string]any)
-		out[slog.MessageKey] = msg
-		for i := range attrs {
-			k, v := attrs[i].Key, attrs[i].Val
-			switch k {
-			case "TEST_TIME":
-				out[slog.TimeKey] = v
-			case "TEST_LEVEL":
-				out[slog.LevelKey] = v
-			default:
-				parts := strings.Split(k, "_")
-				Ng := len(parts) - 1 // number of groups
-				g := out
-				for i := range Ng {
-					next, _ := g[parts[i]].(map[string]any)
-					if next == nil {
-						next = make(map[string]any)
-						g[parts[i]] = next
-					}
-					g = next
-				}
-				g[strings.ToLower(parts[Ng])] = v
-			}
-		}
-		return out
-	}
-
-	slogtest.Run(t, newHandler, result)
-}