diff --git a/platforms/nuttx/src/px4/common/px4_protected_layers.cmake b/platforms/nuttx/src/px4/common/px4_protected_layers.cmake
index a1c6ebc391..c55fe568d3 100644
--- a/platforms/nuttx/src/px4/common/px4_protected_layers.cmake
+++ b/platforms/nuttx/src/px4/common/px4_protected_layers.cmake
@@ -46,6 +46,7 @@ target_link_libraries(px4_layer
 
 add_library(px4_kernel_layer
 	${KERNEL_SRCS}
+	SerialImpl.cpp
 )
 
 target_link_libraries(px4_kernel_layer