diff --git a/src/p_floor.c b/src/p_floor.c
index 1a8bac488..818ad1f35 100644
--- a/src/p_floor.c
+++ b/src/p_floor.c
@@ -1749,8 +1749,9 @@ void EV_DoFloorOLD(mtag_t tag, line_t *line, floor_e floortype)
 
 				// chained linedef executing ability
 				// Only set it on one of the moving sectors (the smallest numbered)
-				if (line->args[4])
-					dofloor->tag = firstone ? (INT16)line->args[3] : -1;
+				// and only if arg 4 is positive, indicating a valid tag.
+				if (firstone && line->args[4])
+					dofloor->tag = firstone ? (INT16)(line->args[4] - 32769) : -1;
 
 				// flat changing ability
 				dofloor->texture = line->args[5] ? line->frontsector->floorpic : -1;
diff --git a/src/p_spec.c b/src/p_spec.c
index 4ca222114..ba62c3553 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -2637,6 +2637,15 @@ boolean P_ProcessSpecial(activator_t *activator, INT16 special, INT32 *args, cha
 						return false;
 					}
 
+					if (mapnamespace == MNS_SRB2KART)
+					{
+						if (line->args[2] != TMP_CEILING)
+							EV_DoFloor(line->args[1], line, moveFloorByFrontSector);
+						if (line->args[2] != TMP_FLOOR)
+							EV_DoCeiling(line->args[1], line, moveCeilingByFrontSector);
+						break;
+					}
+
 					copySector = line->frontsector;
 				}
 				else