diff --git a/src/ride/water/submarine_ride.c b/src/ride/water/submarine_ride.c
index 114c3669e4..1b502c077b 100644
--- a/src/ride/water/submarine_ride.c
+++ b/src/ride/water/submarine_ride.c
@@ -22,12 +22,6 @@
 #include "../../paint/supports.h"
 #include "../ride_data.h"
 
-enum
-{
-	SPR_MONORAIL_ELEM_FLAT_NE_SW = 23231,
-	SPR_MONORAIL_ELEM_FLAT_SE_NW = 23232,
-} SPR_MONORAIL;
-
 enum
 {
 	SEGMENT_B4 = (1 << 0),