diff --git a/pylti1p3/service_connector.py b/pylti1p3/service_connector.py
index d50149f..d0dd8a8 100644
--- a/pylti1p3/service_connector.py
+++ b/pylti1p3/service_connector.py
@@ -132,7 +132,8 @@ def make_service_request(
         if link_header:
             match = re.search(
                 r'<([^>]*)>;\s*rel="next"',
-                link_header.replace("\n", " ").lower().strip(),
+                link_header.replace("\n", " ").strip(),
+                re.IGNORECASE
             )
             if match:
                 next_page_url = match.group(1)