diff --git a/first/ackbuilder.lua b/first/ackbuilder.lua
index fbe0ee733..52dd97dcd 100644
--- a/first/ackbuilder.lua
+++ b/first/ackbuilder.lua
@@ -425,7 +425,7 @@ local function install_make_environment()
 			emit(name..":", ins[i], "\n")
 		end
 		for i = 1, #outs do
-			emit(outs[i]..":", name, "\n")
+			emit(outs[i]..":", name, ";\n")
 		end
 		emit(name..":\n")