diff --git a/blti/validators.py b/blti/validators.py
index 8fd2c76..f14580b 100644
--- a/blti/validators.py
+++ b/blti/validators.py
@@ -28,6 +28,11 @@ def client_key_length(self):
     def nonce_length(self):
         return 20, 50
 
+    @property
+    def enforce_ssl(self):
+        return getattr(
+            settings, 'LTI_ENFORCE_SSL', True)
+
     @property
     def safe_characters(self):
         return set(UNICODE_ASCII_CHARACTER_SET) | set('-_')