diff --git a/libraries/AP_LTM_Telem/AP_LTM_Telem.h b/libraries/AP_LTM_Telem/AP_LTM_Telem.h
index f0315f7f97..245baf758e 100644
--- a/libraries/AP_LTM_Telem/AP_LTM_Telem.h
+++ b/libraries/AP_LTM_Telem/AP_LTM_Telem.h
@@ -17,7 +17,7 @@
 #include <AP_HAL/AP_HAL.h>
 
 #ifndef AP_LTM_TELEM_ENABLED
-#define AP_LTM_TELEM_ENABLED 1
+#define AP_LTM_TELEM_ENABLED BOARD_FLASH_SIZE > 2048
 #endif
 
 #if AP_LTM_TELEM_ENABLED