diff --git a/pyencrypt/loader.py b/pyencrypt/loader.py
index 56f78a7..a4f6bc2 100644
--- a/pyencrypt/loader.py
+++ b/pyencrypt/loader.py
@@ -107,5 +107,9 @@ def invalidate_caches(cls):
 
 
 # TODO: generate randomly AES Class
-machinery.EXTENSION_SUFFIXES.append(ENCRYPT_SUFFIX)
-sys.meta_path.insert(0, EncryptFileFinder)
+def _install():
+    machinery.EXTENSION_SUFFIXES.append(ENCRYPT_SUFFIX)
+    sys.meta_path.insert(0, EncryptFileFinder)
+
+
+_install()