diff --git a/src/p_spec.c b/src/p_spec.c
index a363b3e9b..9de5f1406 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -2831,12 +2831,13 @@ void P_ProcessSpecial(activator_t *activator, INT16 special, INT32 *args, char *
 			break;
 
 		case 428: // Start floating platform movement
-			if (line == NULL)
-			{
-				break; // TODO
-			}
-
-			EV_DoElevator(args[0], line, elevateContinuous);
+			EV_DoContinuousElevator(
+				args[0],
+				args[1] << (FRACBITS - 2),
+				args[2],
+				args[3],
+				(args[4] == 0)
+			);
 			break;
 
 		case 429: // Crush planes once