diff --git a/libraries/AP_SerialManager/AP_SerialManager.cpp b/libraries/AP_SerialManager/AP_SerialManager.cpp
index 5b961da072..24a694e2d0 100644
--- a/libraries/AP_SerialManager/AP_SerialManager.cpp
+++ b/libraries/AP_SerialManager/AP_SerialManager.cpp
@@ -28,37 +28,6 @@
 #include "AP_SerialManager.h"
 #include <GCS_MAVLink/GCS.h>
 
-#ifndef HAL_HAVE_SERIAL0
-#define HAL_HAVE_SERIAL0 HAL_NUM_SERIAL_PORTS > 0
-#endif
-#ifndef HAL_HAVE_SERIAL1
-#define HAL_HAVE_SERIAL1 HAL_NUM_SERIAL_PORTS > 1
-#endif
-#ifndef HAL_HAVE_SERIAL2
-#define HAL_HAVE_SERIAL2 HAL_NUM_SERIAL_PORTS > 2
-#endif
-#ifndef HAL_HAVE_SERIAL3
-#define HAL_HAVE_SERIAL3 HAL_NUM_SERIAL_PORTS > 3
-#endif
-#ifndef HAL_HAVE_SERIAL4
-#define HAL_HAVE_SERIAL4 HAL_NUM_SERIAL_PORTS > 4
-#endif
-#ifndef HAL_HAVE_SERIAL5
-#define HAL_HAVE_SERIAL5 HAL_NUM_SERIAL_PORTS > 5
-#endif
-#ifndef HAL_HAVE_SERIAL6
-#define HAL_HAVE_SERIAL6 HAL_NUM_SERIAL_PORTS > 6
-#endif
-#ifndef HAL_HAVE_SERIAL7
-#define HAL_HAVE_SERIAL7 HAL_NUM_SERIAL_PORTS > 7
-#endif
-#ifndef HAL_HAVE_SERIAL8
-#define HAL_HAVE_SERIAL8 HAL_NUM_SERIAL_PORTS > 8
-#endif
-#ifndef HAL_HAVE_SERIAL9
-#define HAL_HAVE_SERIAL9 HAL_NUM_SERIAL_PORTS > 9
-#endif
-
 extern const AP_HAL::HAL& hal;
 
 #ifndef DEFAULT_SERIAL0_PROTOCOL
diff --git a/libraries/AP_SerialManager/AP_SerialManager_config.h b/libraries/AP_SerialManager/AP_SerialManager_config.h
index 386d15dbfb..88bf3ccaa3 100644
--- a/libraries/AP_SerialManager/AP_SerialManager_config.h
+++ b/libraries/AP_SerialManager/AP_SerialManager_config.h
@@ -136,3 +136,34 @@
 #define AP_SERIALMANAGER_IMUOUT_BAUD           921600
 #define AP_SERIALMANAGER_IMUOUT_BUFSIZE_RX     128
 #define AP_SERIALMANAGER_IMUOUT_BUFSIZE_TX     2048
+
+#ifndef HAL_HAVE_SERIAL0
+#define HAL_HAVE_SERIAL0 HAL_NUM_SERIAL_PORTS > 0
+#endif
+#ifndef HAL_HAVE_SERIAL1
+#define HAL_HAVE_SERIAL1 HAL_NUM_SERIAL_PORTS > 1
+#endif
+#ifndef HAL_HAVE_SERIAL2
+#define HAL_HAVE_SERIAL2 HAL_NUM_SERIAL_PORTS > 2
+#endif
+#ifndef HAL_HAVE_SERIAL3
+#define HAL_HAVE_SERIAL3 HAL_NUM_SERIAL_PORTS > 3
+#endif
+#ifndef HAL_HAVE_SERIAL4
+#define HAL_HAVE_SERIAL4 HAL_NUM_SERIAL_PORTS > 4
+#endif
+#ifndef HAL_HAVE_SERIAL5
+#define HAL_HAVE_SERIAL5 HAL_NUM_SERIAL_PORTS > 5
+#endif
+#ifndef HAL_HAVE_SERIAL6
+#define HAL_HAVE_SERIAL6 HAL_NUM_SERIAL_PORTS > 6
+#endif
+#ifndef HAL_HAVE_SERIAL7
+#define HAL_HAVE_SERIAL7 HAL_NUM_SERIAL_PORTS > 7
+#endif
+#ifndef HAL_HAVE_SERIAL8
+#define HAL_HAVE_SERIAL8 HAL_NUM_SERIAL_PORTS > 8
+#endif
+#ifndef HAL_HAVE_SERIAL9
+#define HAL_HAVE_SERIAL9 HAL_NUM_SERIAL_PORTS > 9
+#endif