diff --git a/extmod/modnetwork.c b/extmod/modnetwork.c
index 87e155e091..e05bfdb11d 100644
--- a/extmod/modnetwork.c
+++ b/extmod/modnetwork.c
@@ -44,6 +44,11 @@
 #include "lwip/apps/mdns.h"
 #endif
 
+#if MICROPY_PY_NETWORK_CYW43 && MICROPY_PY_NETWORK_CYW43_USE_LIB_DRIVER
+// So that CYW43_LINK_xxx constants are available to MICROPY_PORT_NETWORK_INTERFACES.
+#include "lib/cyw43-driver/src/cyw43.h"
+#endif
+
 /// \module network - network configuration
 ///
 /// This module provides network drivers and routing configuration.