diff --git a/setup.py b/setup.py
index e86b1b2..9d34d0d 100644
--- a/setup.py
+++ b/setup.py
@@ -29,19 +29,7 @@ if sys.version_info < (3, 6):
 
 ROOT_PATH = os.path.abspath(os.path.dirname(__file__))
 
-rj_include_dir = './rapidjson/include'
-
-for idx, arg in enumerate(sys.argv[:]):
-    if arg.startswith('--rj-include-dir='):
-        sys.argv.pop(idx)
-        rj_include_dir = arg.split('=', 1)[1]
-        break
-else:
-    if not os.path.isdir(os.path.join(ROOT_PATH, 'rapidjson', 'include')):
-        raise RuntimeError("RapidJSON sources not found: if you cloned the git"
-                           " repository, you should initialize the rapidjson submodule"
-                           " as explained in the README.rst; in all other cases you may"
-                           " want to report the issue.")
+rj_include_dir = '@rapidjson@/include'
 
 with open('version.txt', encoding='utf-8') as f:
     VERSION = f.read()