diff --git a/boards/atl/mantis-edu/src/board_config.h b/boards/atl/mantis-edu/src/board_config.h
index f589a6b728..b8c1709a93 100644
--- a/boards/atl/mantis-edu/src/board_config.h
+++ b/boards/atl/mantis-edu/src/board_config.h
@@ -59,7 +59,6 @@
 #define BOARD_ARMED_STATE_LED  LED_BLUE
 
 #define FLASH_BASED_PARAMS
-#define RAM_BASED_MISSIONS
 
 // Hacks for MAVLink RC button input
 #define ATL_MANTIS_RC_INPUT_HACKS
diff --git a/src/modules/navigator/navigation.h b/src/modules/navigator/navigation.h
index 520430c014..f3db822a8f 100644
--- a/src/modules/navigator/navigation.h
+++ b/src/modules/navigator/navigation.h
@@ -50,8 +50,6 @@
 #  define NUM_MISSIONS_SUPPORTED 50
 #elif defined(__PX4_POSIX)
 #  define NUM_MISSIONS_SUPPORTED (UINT16_MAX-1) // This is allocated as needed.
-#elif defined(RAM_BASED_MISSIONS)
-#  define NUM_MISSIONS_SUPPORTED 500
 #else
 #  define NUM_MISSIONS_SUPPORTED 500
 #endif