diff --git a/pynq/remote/mmio_pb2.py b/pynq/remote/mmio_pb2.py
index 7cb5fc0fb..0bb1ff866 100644
--- a/pynq/remote/mmio_pb2.py
+++ b/pynq/remote/mmio_pb2.py
@@ -14,7 +14,7 @@
 
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\nmmio.proto\x12\x04mmio\"3\n\x0eGetMmioRequest\x12\x11\n\tbase_addr\x18\x01 \x01(\x04\x12\x0e\n\x06length\x18\x02 \x01(\x04\"]\n\x0fGetMmioResponse\x12\x0e\n\x06status\x18\x01 \x01(\x08\x12\x10\n\x03msg\x18\x02 \x01(\tH\x00\x88\x01\x01\x12\x14\n\x07mmio_id\x18\x03 \x01(\tH\x01\x88\x01\x01\x42\x06\n\x04_msgB\n\n\x08_mmio_id\"R\n\x0bReadRequest\x12\x0f\n\x07mmio_id\x18\x01 \x01(\t\x12\x0e\n\x06length\x18\x02 \x01(\x04\x12\x0e\n\x06offset\x18\x03 \x01(\x04\x12\x12\n\nword_order\x18\x04 \x01(\t\"T\n\x0cReadResponse\x12\x0e\n\x06status\x18\x01 \x01(\x08\x12\x10\n\x03msg\x18\x02 \x01(\tH\x00\x88\x01\x01\x12\x11\n\x04\x64\x61ta\x18\x03 \x01(\x05H\x01\x88\x01\x01\x42\x06\n\x04_msgB\x07\n\x05_data\"=\n\x0cWriteRequest\x12\x0f\n\x07mmio_id\x18\x01 \x01(\t\x12\x0e\n\x06offset\x18\x02 \x01(\x04\x12\x0c\n\x04\x64\x61ta\x18\x03 \x01(\x0c\"9\n\rWriteResponse\x12\x0e\n\x06status\x18\x01 \x01(\x08\x12\x10\n\x03msg\x18\x02 \x01(\tH\x00\x88\x01\x01\x42\x06\n\x04_msg2\xa6\x01\n\x04Mmio\x12\x39\n\x08get_mmio\x12\x14.mmio.GetMmioRequest\x1a\x15.mmio.GetMmioResponse\"\x00\x12/\n\x04read\x12\x11.mmio.ReadRequest\x1a\x12.mmio.ReadResponse\"\x00\x12\x32\n\x05write\x12\x12.mmio.WriteRequest\x1a\x13.mmio.WriteResponse\"\x00\x62\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\nmmio.proto\x12\x04mmio\"3\n\x0eGetMmioRequest\x12\x11\n\tbase_addr\x18\x01 \x01(\x04\x12\x0e\n\x06length\x18\x02 \x01(\x04\"]\n\x0fGetMmioResponse\x12\x0e\n\x06status\x18\x01 \x01(\x08\x12\x10\n\x03msg\x18\x02 \x01(\tH\x00\x88\x01\x01\x12\x14\n\x07mmio_id\x18\x03 \x01(\tH\x01\x88\x01\x01\x42\x06\n\x04_msgB\n\n\x08_mmio_id\"R\n\x0bReadRequest\x12\x0f\n\x07mmio_id\x18\x01 \x01(\t\x12\x0e\n\x06length\x18\x02 \x01(\x04\x12\x0e\n\x06offset\x18\x03 \x01(\x04\x12\x12\n\nword_order\x18\x04 \x01(\t\"T\n\x0cReadResponse\x12\x0e\n\x06status\x18\x01 \x01(\x08\x12\x10\n\x03msg\x18\x02 \x01(\tH\x00\x88\x01\x01\x12\x11\n\x04\x64\x61ta\x18\x03 \x01(\rH\x01\x88\x01\x01\x42\x06\n\x04_msgB\x07\n\x05_data\"=\n\x0cWriteRequest\x12\x0f\n\x07mmio_id\x18\x01 \x01(\t\x12\x0e\n\x06offset\x18\x02 \x01(\x04\x12\x0c\n\x04\x64\x61ta\x18\x03 \x01(\x0c\"9\n\rWriteResponse\x12\x0e\n\x06status\x18\x01 \x01(\x08\x12\x10\n\x03msg\x18\x02 \x01(\tH\x00\x88\x01\x01\x42\x06\n\x04_msg2\xa6\x01\n\x04Mmio\x12\x39\n\x08get_mmio\x12\x14.mmio.GetMmioRequest\x1a\x15.mmio.GetMmioResponse\"\x00\x12/\n\x04read\x12\x11.mmio.ReadRequest\x1a\x12.mmio.ReadResponse\"\x00\x12\x32\n\x05write\x12\x12.mmio.WriteRequest\x1a\x13.mmio.WriteResponse\"\x00\x62\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
diff --git a/sdbuild/boot/meta-pynq/recipes-apps/pynq-cpp/files/protos/mmio.proto b/sdbuild/boot/meta-pynq/recipes-apps/pynq-cpp/files/protos/mmio.proto
index d4f5982f7..a0ed428a5 100644
--- a/sdbuild/boot/meta-pynq/recipes-apps/pynq-cpp/files/protos/mmio.proto
+++ b/sdbuild/boot/meta-pynq/recipes-apps/pynq-cpp/files/protos/mmio.proto
@@ -29,7 +29,7 @@ message ReadRequest {
 message ReadResponse {
     bool status = 1;
     optional string msg = 2;
-    optional int32 data = 3;
+    optional uint32 data = 3;
 }
 
 message WriteRequest {