diff --git a/newgrf.c b/newgrf.c
index e51307eba1..9846a0ba1f 100644
--- a/newgrf.c
+++ b/newgrf.c
@@ -2183,8 +2183,8 @@ static uint32 GetParamVal(byte param, uint32 *cond_val)
 		case 0x83: /* current climate, 0=temp, 1=arctic, 2=trop, 3=toyland */
 			return _opt.landscape;
 
-		case 0x84: /* .grf loading stage, 0=initialization, 1=activation */
-			return _cur_stage;
+		case 0x84: /* GRF loading stage */
+			return (_cur_stage > GLS_INIT) | ((_cur_stage == GLS_ACTIVATION) << 9);
 
 		case 0x85: /* TTDPatch flags, only for bit tests */
 			if (cond_val == NULL) {