diff --git a/files/helpers/sanitize.py b/files/helpers/sanitize.py
index d35d5f72c0..f0d2a33b7c 100644
--- a/files/helpers/sanitize.py
+++ b/files/helpers/sanitize.py
@@ -152,7 +152,7 @@ def sanitize(sanitized, noimages=False, alert=False, comment=False, edit=False):
 
 	for tag in soup.find_all("img"):
 
-		if tag.get("src") and tag.get("class") != "pp20":
+		if tag.get("src") and tag.get("class") != ['pp20']:
 			tag["class"] = "in-comment-image"
 			tag["loading"] = "lazy"
 			tag["data-src"] = tag["src"]