diff --git a/language.version b/language.version
index 6802fb1b9..5f2f9122e 100644
--- a/language.version
+++ b/language.version
@@ -1,3 +1,3 @@
 [default]
-SWWM_MODVER="\cyDEMOLITIONIST \cw1.3pre r1206 \cu(mar 18 mar 2025 22:44:17 CET)\c-";
-SWWM_SHORTVER="\cw1.3pre r1206 \cu(2025-03-18 22:44:17)\c-";
+SWWM_MODVER="\cyDEMOLITIONIST \cw1.3pre r1207 \cu(mar 18 mar 2025 22:44:26 CET)\c-";
+SWWM_SHORTVER="\cw1.3pre r1207 \cu(2025-03-18 22:44:26)\c-";
diff --git a/zscript/player/swwm_player_tick.zsc b/zscript/player/swwm_player_tick.zsc
index cb61f20fe..8cb5a58cc 100644
--- a/zscript/player/swwm_player_tick.zsc
+++ b/zscript/player/swwm_player_tick.zsc
@@ -308,8 +308,13 @@ extend Class Demolitionist
 			SWWMHandler.CancelOneliner("falling");
 			airscreamtime = 0;
 			cairtime = 0;
+			// only increase counter for achievement by kilometers alone, as an integer
+			// (previously this used a double, but it broke with large values)
+			let oldgroundkm = int(mystats.grounddist/32000.);
 			mystats.grounddist += traveldist;
-			SWWMUtility.AchievementProgressIncDouble("travel",traveldist/32000.,player);
+			let newgroundkm = int(mystats.grounddist/32000.);
+			if ( newgroundkm > oldgroundkm )
+				SWWMUtility.AchievementProgressInc("travel",newgroundkm-oldgroundkm,player);
 		}
 		// spawn bubbles while underwater
 		if ( (waterlevel > 1) && !Random[ExploS](0,5) )