diff --git a/Formula/dash.rb b/Formula/dash.rb
index 7bad1f5770..3ce063ca9c 100644
--- a/Formula/dash.rb
+++ b/Formula/dash.rb
@@ -7,10 +7,10 @@ class Dash < Formula
 
   head 'https://git.kernel.org/pub/scm/utils/dash/dash.git'
 
-  depends_on :automake if ARGV.build_head?
+  depends_on :automake if build.head?
 
   def install
-    if ARGV.build_head?
+    if build.head?
       system "aclocal"
       system "autoreconf -f -i -Wall,no-obsolete"
     end