diff --git a/getBlocks.lua b/getBlocks.lua
index b1e30ae..5998775 100644
--- a/getBlocks.lua
+++ b/getBlocks.lua
@@ -4,7 +4,7 @@ if #args < 1 then
     return
 end
 
-numBlocks = tonumber(args[1])
+local numBlocks = tonumber(args[1])
 if numBlocks == nil then
     print("Failed to parse number of blocks")
     return