diff --git a/software/apps/slave_node/src/main.c b/software/apps/slave_node/src/main.c
index d9d2e08..acb711c 100644
--- a/software/apps/slave_node/src/main.c
+++ b/software/apps/slave_node/src/main.c
@@ -22,7 +22,7 @@ int main(void) {
 
   rc = modbus_server_init();
   if (rc < 0) {
-    LOG_ERR("Modbus RTU server initialization failed");
+    LOG_ERR("Modbus RTU server initialization failed: %d", rc);
     return 0;
   }