diff --git a/lib/lum.lua b/lib/lum.lua
index 7f07fbe..1a66b4c 100644
--- a/lib/lum.lua
+++ b/lib/lum.lua
@@ -40,7 +40,7 @@ function install(package)
     local dir = bin_path
     --if package starts with lib then remove lib
     if string.sub(package, 1, 3) == "lib" then
-        package = string.sub(package, 5)
+        package = string.sub(package, 4)
         dir = lib_path
     end