diff --git a/init.lua b/init.lua
index 4637738..e065f68 100644
--- a/init.lua
+++ b/init.lua
@@ -258,12 +258,14 @@ do
 	local oldthru = glyphdef.on_node_touchthru
 	if oldthru then
 		rawset(glyphdef, "on_node_touchthru", function(pos, node, under, player, ...)
-				local raw = nodecore.touchtip_node(under, nil, player)
-				if raw and vector.equals(vector.subtract(under, pos),
-					nodecore.facedirs[node.param2].b) then
-					return ziprunedesc .. raw
+				if isziprune(pos, node) then
+					local raw = nodecore.touchtip_node(under, nil, player)
+					if raw and vector.equals(vector.subtract(under, pos),
+						nodecore.facedirs[node.param2].b) then
+						return ziprunedesc .. raw
+					end
 				end
-				return oldthru(pos, node, ...)
+				return oldthru(pos, node, under, player, ...)
 			end)
 	end
 end