diff --git a/ports/stm32/boards/ARDUINO_OPTA/manifest.py b/ports/stm32/boards/ARDUINO_OPTA/manifest.py
index b7b9a2b470..375f4c3333 100644
--- a/ports/stm32/boards/ARDUINO_OPTA/manifest.py
+++ b/ports/stm32/boards/ARDUINO_OPTA/manifest.py
@@ -14,5 +14,8 @@ require("aioble")
 # Register external library
 add_library("arduino-lib", "$(ARDUINO_LIB_DIR)")
 
+# Opta modules.
+require("opta", library="arduino-lib")
+
 # RPC
 require("msgpackrpc", library="arduino-lib")