diff --git a/sys/apis/util.lua b/sys/apis/util.lua
index b77d444..7f87230 100644
--- a/sys/apis/util.lua
+++ b/sys/apis/util.lua
@@ -132,7 +132,7 @@ end
 -- http://lua-users.org/wiki/SimpleRound
 function Util.round(num, idp)
 	local mult = 10^(idp or 0)
-	return util.signum(num) * math.floor(math.abs(num) * mult + 0.5) / mult
+	return Util.signum(num) * math.floor(math.abs(num) * mult + 0.5) / mult
 end
 
 function Util.randomFloat(max, min)