diff --git a/game.cpp b/game.cpp
index 59996984..9125c034 100644
--- a/game.cpp
+++ b/game.cpp
@@ -7584,11 +7584,13 @@ void pushThumper(cell *th, cell *cto) {
   else if(cellUnstableOrChasm(cto)) {
     addMessage(XLAT("%The1 fills the hole!", w));
     cto->wall = w == waThumperOn ? waTempFloor : waNone;
+    cto->wparam = th->wparam;
     playSound(cto, "click");
     }
   else if(isWatery(cto)) {
     addMessage(XLAT("%The1 fills the hole!", w));
     cto->wall = w == waThumperOn ? waTempBridge : waNone;
+    cto->wparam = th->wparam;
     playSound(cto, "splash"+pick12());
     }
   else