diff --git a/node/cmd/guardiand/logging.go b/node/cmd/guardiand/logging.go
new file mode 100644
index 000000000..53f360964
--- /dev/null
+++ b/node/cmd/guardiand/logging.go
@@ -0,0 +1,28 @@
+package guardiand
+
+import (
+	"go.uber.org/zap/buffer"
+	"go.uber.org/zap/zapcore"
+	"unicode"
+)
+
+type consoleEncoder struct {
+	zapcore.Encoder
+}
+
+func (e consoleEncoder) EncodeEntry(entry zapcore.Entry, fields []zapcore.Field) (*buffer.Buffer, error) {
+	buf, err := e.Encoder.EncodeEntry(entry, fields)
+	if err != nil {
+		buf.Free()
+		return nil, err
+	}
+
+	b := buf.Bytes()
+	for i := range b {
+		if unicode.IsControl(rune(b[i])) && !unicode.IsSpace(rune(b[i])) {
+			b[i] = '\x1A' // Substitute character
+		}
+	}
+
+	return buf, nil
+}
diff --git a/node/cmd/guardiand/node.go b/node/cmd/guardiand/node.go
index 259bbd417..fba788526 100644
--- a/node/cmd/guardiand/node.go
+++ b/node/cmd/guardiand/node.go
@@ -245,12 +245,11 @@ func runNode(cmd *cobra.Command, args []string) {
 		os.Exit(1)
 	}
 
-	cfg := zap.NewDevelopmentConfig()
-	cfg.Level = zap.NewAtomicLevelAt(zapcore.Level(lvl))
-	logger, err := cfg.Build()
-	if err != nil {
-		panic(err)
-	}
+	logger := zap.New(zapcore.NewCore(
+		consoleEncoder{zapcore.NewConsoleEncoder(
+			zap.NewDevelopmentEncoderConfig())},
+		zapcore.AddSync(zapcore.Lock(os.Stderr)),
+		zap.NewAtomicLevelAt(zapcore.Level(lvl))))
 
 	if *unsafeDevMode {
 		// Use the hostname as nodeName. For production, we don't want to do this to
diff --git a/node/pkg/p2p/p2p.go b/node/pkg/p2p/p2p.go
index 073f29ebd..f8c7ec6c9 100644
--- a/node/pkg/p2p/p2p.go
+++ b/node/pkg/p2p/p2p.go
@@ -293,7 +293,7 @@ func Run(obsvC chan *gossipv1.SignedObservation, sendC chan []byte, signedInC ch
 			err = proto.Unmarshal(envelope.Data, &msg)
 			if err != nil {
 				logger.Info("received invalid message",
-					zap.String("data", string(envelope.Data)),
+					zap.Binary("data", envelope.Data),
 					zap.String("from", envelope.GetFrom().String()))
 				p2pMessagesReceived.WithLabelValues("invalid").Inc()
 				continue