diff --git a/zscript/swwm_common.zsc b/zscript/swwm_common.zsc
index 318c7a618..6eaf8bf97 100644
--- a/zscript/swwm_common.zsc
+++ b/zscript/swwm_common.zsc
@@ -1746,7 +1746,7 @@ Class SWWMHandler : EventHandler
 			// restore underwater sounds for players
 			for ( int i=0; i<MAXPLAYERS; i++ )
 			{
-				if ( !playeringame[i] || (players[i].mo is 'Demolitionist') ) continue;
+				if ( !playeringame[i] || !(players[i].mo is 'Demolitionist') ) continue;
 				Demolitionist(players[i].mo).CheckUnderwaterAmb(true);
 			}
 		}