diff --git a/pw_hdlc_lite/public/pw_hdlc_lite/rpc_server_packets.h b/pw_hdlc_lite/public/pw_hdlc_lite/rpc_server_packets.h
index 45b639e..5074594 100644
--- a/pw_hdlc_lite/public/pw_hdlc_lite/rpc_server_packets.h
+++ b/pw_hdlc_lite/public/pw_hdlc_lite/rpc_server_packets.h
@@ -39,7 +39,7 @@
   std::byte data;
 
   while (true) {
-    if (pw::sys_io::ReadByte(&data).ok()) {
+    if (!pw::sys_io::ReadByte(&data).ok()) {
       return;
     }
 
@@ -51,4 +51,4 @@
   }
 }
 
-}  // namespace pw::rpc
\ No newline at end of file
+}  // namespace pw::rpc