diff --git a/msg/templates/urtps/microRTPS_transport.cxx b/msg/templates/urtps/microRTPS_transport.cxx
index 38a8f38869..88b0131c3e 100644
--- a/msg/templates/urtps/microRTPS_transport.cxx
+++ b/msg/templates/urtps/microRTPS_transport.cxx
@@ -96,7 +96,7 @@ uint16_t Transport_node::crc16(uint8_t const *buffer, size_t len)
     return crc;
 }
 
-ssize_t Transport_node::read(char* topic_ID, char out_buffer[], size_t buffer_len)
+ssize_t Transport_node::read(uint8_t* topic_ID, char out_buffer[], size_t buffer_len)
 {
     if (nullptr == out_buffer || nullptr == topic_ID || !fds_OK()) return -1;
 
@@ -181,7 +181,7 @@ ssize_t Transport_node::read(char* topic_ID, char out_buffer[], size_t buffer_le
     return len;
 }
 
-ssize_t Transport_node::write(const char topic_ID, char buffer[], size_t length)
+ssize_t Transport_node::write(const uint8_t topic_ID, char buffer[], size_t length)
 {
     if (!fds_OK()) return -1;
 
diff --git a/msg/templates/urtps/microRTPS_transport.h b/msg/templates/urtps/microRTPS_transport.h
index fd69d10a31..365159b02e 100644
--- a/msg/templates/urtps/microRTPS_transport.h
+++ b/msg/templates/urtps/microRTPS_transport.h
@@ -45,8 +45,8 @@ public:
 
     virtual int init() {return 0;}
     virtual uint8_t close() {return 0;}
-    ssize_t read(char* topic_ID, char out_buffer[], size_t buffer_len);
-    ssize_t write(const char topic_ID, char buffer[], size_t length);
+    ssize_t read(uint8_t* topic_ID, char out_buffer[], size_t buffer_len);
+    ssize_t write(const uint8_t topic_ID, char buffer[], size_t length);
 
 protected:
     virtual ssize_t node_read(void *buffer, size_t len) = 0;