diff --git a/Formula/libcec.rb b/Formula/libcec.rb
index b87cb6b33d0..d55ff60387b 100644
--- a/Formula/libcec.rb
+++ b/Formula/libcec.rb
@@ -5,10 +5,10 @@ class Libcec < Formula
   url 'https://github.com/Pulse-Eight/libcec/archive/libcec-2.1.4.tar.gz'
   sha1 '3ee241201b3650b97ec4fc41b0f5dd33476080f9'
 
-  depends_on :autoconf
-  depends_on :automake
-  depends_on :libtool
-  depends_on 'pkg-config' => :build
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
+  depends_on "libtool" => :build
+  depends_on "pkg-config" => :build
 
   def install
     system "./bootstrap"