diff --git a/scripts/dev/build_release.py b/scripts/dev/build_release.py
index 57fa1d724..3a8f8305b 100755
--- a/scripts/dev/build_release.py
+++ b/scripts/dev/build_release.py
@@ -50,17 +50,18 @@ def call_script(name, *args, python=sys.executable):
     subprocess.check_call([python, path] + list(args))
 
 
-def call_freeze(*args, python=sys.executable):
-    """Call freeze.py via tox.
+def call_tox(toxenv, *args, python=sys.executable):
+    """Call tox.
 
     Args:
+        toxenv: Which tox environment to use
         *args: The arguments to pass.
         python: The python interpreter to use.
     """
     env = os.environ.copy()
     env['PYTHON'] = python
     subprocess.check_call(
-        [sys.executable, '-m', 'tox', '-e', 'cxfreeze-windows'] + list(args),
+        [sys.executable, '-m', 'tox', '-e', toxenv] + list(args),
         env=env)
 
 
@@ -88,6 +89,12 @@ def smoke_test(executable):
                           '--temp-basedir', 'about:blank', ':later 500 quit'])
 
 
+def build_osx():
+    """Build OS X .dmg/.app."""
+    utils.print_title("Building .app via pyinstaller")
+    call_tox('pyinstaller')
+
+
 def build_windows():
     """Build windows executables/setups."""
     utils.print_title("Updating 3rdparty content")
@@ -101,13 +108,13 @@ def build_windows():
     python_x64 = r'C:\Python{}'.format(ver)
 
     utils.print_title("Running 32bit freeze.py build_exe")
-    call_freeze('build_exe', python=python_x86)
+    call_tox('cxfreeze-windows', 'build_exe', python=python_x86)
     utils.print_title("Running 32bit freeze.py bdist_msi")
-    call_freeze('bdist_msi', python=python_x86)
+    call_tox('cxfreeze-windows', 'bdist_msi', python=python_x86)
     utils.print_title("Running 64bit freeze.py build_exe")
-    call_freeze('build_exe', python=python_x64)
+    call_tox('cxfreeze-windows', 'build_exe', python=python_x64)
     utils.print_title("Running 64bit freeze.py bdist_msi")
-    call_freeze('bdist_msi', python=python_x64)
+    call_tox('cxfreeze-windows', 'bdist_msi', python=python_x64)
 
     utils.print_title("Running 32bit smoke test")
     smoke_test('build/exe.win32-{}/qutebrowser.exe'.format(dotver))
@@ -201,6 +208,8 @@ def main():
             sys.exit(1)
         run_asciidoc2html(args)
         build_windows()
+    elif sys.platform == 'darwin':
+        build_osx()
     else:
         build_sdist()