diff --git a/Formula/cryfs.rb b/Formula/cryfs.rb
index 6449773a7aef..e3108ab1e272 100644
--- a/Formula/cryfs.rb
+++ b/Formula/cryfs.rb
@@ -3,7 +3,6 @@ class Cryfs < Formula
   homepage "https://www.cryfs.org"
   url "https://github.com/cryfs/cryfs/releases/download/0.9.9/cryfs-0.9.9.tar.xz"
   sha256 "aa8d90bb4c821cf8347f0f4cbc5f68a1e0f4eb461ffd8f1ee093c4d37eac2908"
-  head "https://github.com/cryfs/cryfs.git", :branch => "develop"
 
   bottle do
     cellar :any
@@ -13,6 +12,11 @@ class Cryfs < Formula
     sha256 "2fab8415b94e7b2f782ec642e2e4fb0ce345524f5fd014cc21d14b2b410c8635" => :el_capitan
   end
 
+  head do
+    url "https://github.com/cryfs/cryfs.git", :branch => "develop", :shallow => false
+    depends_on "libomp"
+  end
+
   depends_on "cmake" => :build
   depends_on "boost"
   depends_on "cryptopp"
@@ -22,7 +26,22 @@ class Cryfs < Formula
   needs :cxx11
 
   def install
-    system "cmake", ".", "-DBUILD_TESTING=off", *std_cmake_args
+    configure_args = [
+      "-DBUILD_TESTING=off",
+    ]
+
+    if build.head?
+      libomp = Formula["libomp"]
+      configure_args.concat(
+        [
+          "-DOpenMP_CXX_FLAGS='-Xpreprocessor -fopenmp -I#{libomp.include}'",
+          "-DOpenMP_CXX_LIB_NAMES=omp",
+          "-DOpenMP_omp_LIBRARY=#{libomp.lib}/libomp.dylib",
+        ],
+      )
+    end
+
+    system "cmake", ".", *configure_args, *std_cmake_args
     system "make", "install"
   end