diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 146d5ce0fc..e9907cf386 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -510,6 +510,10 @@ class GitDownloadStrategy < VCSDownloadStrategy
 
   private
 
+  def support_depth?
+    @ref_type != :revision && SHALLOW_CLONE_WHITELIST.any? { |rx| rx === @url }
+  end
+
   def git_dir
     @clone.join(".git")
   end
@@ -518,14 +522,6 @@ class GitDownloadStrategy < VCSDownloadStrategy
     quiet_system 'git', '--git-dir', git_dir, 'rev-parse', '-q', '--verify', @ref
   end
 
-  def support_depth?
-    @ref_type != :revision and host_supports_depth?
-  end
-
-  def host_supports_depth?
-    SHALLOW_CLONE_WHITELIST.any? { |rx| rx === @url }
-  end
-
   def repo_valid?
     quiet_system "git", "--git-dir", git_dir, "status", "-s"
   end