diff --git a/scrapy/http/request/form.py b/scrapy/http/request/form.py
index d033a830e..95b38e990 100644
--- a/scrapy/http/request/form.py
+++ b/scrapy/http/request/form.py
@@ -170,8 +170,8 @@ def _get_clickable(clickdata, form):
     """
     clickables = [
         el for el in form.xpath(
-            'descendant::input[re.test(@type, "^(submit|image)$", "i")]'
-            '|descendant::button[not(@type) or re.test(@type, "^submit$", "i")]',
+            'descendant::input[re:test(@type, "^(submit|image)$", "i")]'
+            '|descendant::button[not(@type) or re:test(@type, "^submit$", "i")]',
             namespaces={"re": "http://exslt.org/regular-expressions"})
         ]
     if not clickables: