diff --git a/Formula/ctail.rb b/Formula/ctail.rb
index 57a14ad508..3517cf7b8d 100644
--- a/Formula/ctail.rb
+++ b/Formula/ctail.rb
@@ -5,9 +5,9 @@ class Ctail < Formula
   url 'http://ctail.i-want-a-pony.com/downloads/ctail-0.1.0.tar.bz2'
   sha1 '4bd0373df88136b48cac721c98d34cefda27aff9'
 
-  depends_on :autoconf
-  depends_on :automake
-  depends_on :libtool
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
+  depends_on "libtool" => :build
 
   def install
     system "./configure", "--prefix=#{prefix}", "--disable-debug"