diff --git a/Formula/sleuthkit.rb b/Formula/sleuthkit.rb
index 0d4cb6501a..990202248f 100644
--- a/Formula/sleuthkit.rb
+++ b/Formula/sleuthkit.rb
@@ -7,7 +7,7 @@ class Sleuthkit < Formula
 
   head 'https://github.com/sleuthkit/sleuthkit.git'
 
-  if ARGV.build_head?
+  if build.head?
     depends_on :autoconf
     depends_on :automake
     depends_on :libtool
@@ -19,13 +19,13 @@ class Sleuthkit < Formula
   def patches
     # required for new-ish libewf releases (API change)
     # fixed in the upcoming sleuthkit 4.x
-    if ARGV.build_stable?
+    if build.stable?
       "http://downloads.sourceforge.net/project/libewf/patches%20for%203rd%20party%20software/sleuthkit/tsk3.2.3-libewf.patch"
     end
   end
 
   def install
-    system "./bootstrap" if ARGV.build_head?
+    system "./bootstrap" if build.head?
     system "./configure", "--disable-debug", "--disable-dependency-tracking",
                           "--prefix=#{prefix}"
     system "make install"