diff --git a/libs/libdebuff.lua b/libs/libdebuff.lua
index fe80f769..adae5c6c 100644
--- a/libs/libdebuff.lua
+++ b/libs/libdebuff.lua
@@ -21,7 +21,7 @@ local scanner = libtipscan:GetScanner("libdebuff")
 
 function libdebuff:GetDuration(effect, rank)
   if L["debuffs"][effect] then
-    local rank = rank and tonumber(string.gsub(rank, RANK .. " ", "")) or 0
+    local rank = rank and tonumber((string.gsub(rank, RANK .. " ", ""))) or 0
     local rank = L["debuffs"][effect][rank] and rank or libdebuff:GetMaxRank(effect)
     local duration = L["debuffs"][effect][rank]