diff --git a/markdownify/__init__.py b/markdownify/__init__.py
index 28cdaf6..873f927 100644
--- a/markdownify/__init__.py
+++ b/markdownify/__init__.py
@@ -293,7 +293,7 @@ def _can_ignore(el):
         child_strings = [s for s in child_strings if s]
 
         # Collapse newlines at child element boundaries, if needed.
-        if node.name == 'pre' or node.find_parent('pre'):
+        if node.name == 'pre' or 'pre' in parent_tags:
             # Inside <pre> blocks, do not collapse newlines.
             pass
         else: