diff --git a/src/main/java/li/cil/oc2/common/bus/RPCDeviceBusAdapter.java b/src/main/java/li/cil/oc2/common/bus/RPCDeviceBusAdapter.java
index a00272ae..31e463fa 100644
--- a/src/main/java/li/cil/oc2/common/bus/RPCDeviceBusAdapter.java
+++ b/src/main/java/li/cil/oc2/common/bus/RPCDeviceBusAdapter.java
@@ -11,6 +11,7 @@ import li.cil.oc2.api.bus.device.rpc.RPCParameter;
 import li.cil.oc2.common.Constants;
 import li.cil.oc2.common.bus.device.rpc.RPCDeviceList;
 import li.cil.oc2.common.bus.device.rpc.RPCMethodParameterTypeAdapters;
+import li.cil.oc2.common.serialization.serializers.UnsignedByteArrayJsonSerializer;
 import li.cil.oc2.common.serialization.serializers.MessageJsonDeserializer;
 import li.cil.oc2.common.serialization.serializers.MethodInvocationJsonDeserializer;
 import li.cil.oc2.common.serialization.serializers.RPCDeviceWithIdentifierJsonSerializer;
@@ -62,6 +63,7 @@ public final class RPCDeviceBusAdapter implements Steppable {
         this.serialDevice = serialDevice;
         this.transmitBuffer = ByteBuffer.allocate(maxMessageSize);
         this.gson = RPCMethodParameterTypeAdapters.beginBuildGson()
+                .registerTypeAdapter(byte[].class, new UnsignedByteArrayJsonSerializer())
                 .registerTypeAdapter(MethodInvocation.class, new MethodInvocationJsonDeserializer())
                 .registerTypeAdapter(Message.class, new MessageJsonDeserializer())
                 .registerTypeAdapter(RPCDeviceWithIdentifier.class, new RPCDeviceWithIdentifierJsonSerializer())
diff --git a/src/main/java/li/cil/oc2/common/serialization/serializers/UnsignedByteArrayJsonSerializer.java b/src/main/java/li/cil/oc2/common/serialization/serializers/UnsignedByteArrayJsonSerializer.java
new file mode 100644
index 00000000..b102f4b2
--- /dev/null
+++ b/src/main/java/li/cil/oc2/common/serialization/serializers/UnsignedByteArrayJsonSerializer.java
@@ -0,0 +1,20 @@
+package li.cil.oc2.common.serialization.serializers;
+
+import com.google.gson.*;
+
+import java.lang.reflect.Type;
+
+public final class UnsignedByteArrayJsonSerializer implements JsonSerializer<byte[]> {
+    @Override
+    public JsonElement serialize(final byte[] src, final Type typeOfSrc, final JsonSerializationContext context) {
+        if (src == null) {
+            return JsonNull.INSTANCE;
+        }
+
+        final JsonArray json = new JsonArray();
+        for (final byte b : src) {
+            json.add(b & 0xFF);
+        }
+        return json;
+    }
+}