diff --git a/handlers/gewobag_handler.py b/handlers/gewobag_handler.py
index 44c2d15..b48bfe6 100644
--- a/handlers/gewobag_handler.py
+++ b/handlers/gewobag_handler.py
@@ -215,9 +215,9 @@ class GewobagHandler(BaseHandler):
                     try:
                         mobile_phone = os.environ.get("FORM_PHONE", "")
                         if mobile_phone:
-                            # Wait for the field to appear
-                            await iframe_page.wait_for_selector('#formly_17_input_$$_telephone_number_$$_0', timeout=5000, state='visible')
-                            mobile_input = await iframe_page.query_selector('#formly_17_input_$$_telephone_number_$$_0')
+                            # Wait for the field to appear - need to escape $$ in the selector
+                            await iframe_page.wait_for_selector('#formly_17_input_\\$\\$_telephone_number_\\$\\$_0', timeout=5000, state='visible')
+                            mobile_input = await iframe_page.query_selector('#formly_17_input_\\$\\$_telephone_number_\\$\\$_0')
                             if mobile_input:
                                 await mobile_input.scroll_into_view_if_needed()
                                 await mobile_input.fill(mobile_phone)