diff --git a/compacting-storage.lua b/compacting-storage.lua
index 889edd9..e69c3b0 100644
--- a/compacting-storage.lua
+++ b/compacting-storage.lua
@@ -86,7 +86,7 @@ function drain (type, form, amount)
     elseif form == "ingot" then
         conversion = "ingot_to_block"
     end
-    print("Draining %d %s %ss":format(amount, type, form))
+    print(("Draining %d %s %ss"):format(amount, type, form))
     request_multiple(type, conversion, amount)
 end
 
@@ -101,7 +101,7 @@ function fill (type, dest, amount)
             conversion = "block_to_ingot"
         end
     end
-    print("Converting %d %s %ss to %ss":format(amount, type, src, dest))
+    print(("Converting %d %s %ss to %ss"):format(amount, type, src, dest))
     request_multiple(type, conversion, amount)
 end