ToME: the Tales of Maj'Eyal

diff --git a/game/modules/tome/class/Actor.lua b/game/modules/tome/class/Actor.lua
index a47492e..0d6d26a 100644
--- a/game/modules/tome/class/Actor.lua
+++ b/game/modules/tome/class/Actor.lua
@@ -1715,7 +1715,7 @@ function _M:tooltip(x, y, seen_by)
 
        local retal = 0
        for k, v in pairs(self.on_melee_hit) do
-               if v then retal = retal + v end
+               if tonumber(v) then retal = retal + v end
        end
 
        if retal > 0 then ts:add("Melee Retaliation: ", {"color", "RED"}, tostring(math.floor(retal)), {"color", "WHITE"}, true ) end