diff --git a/patches/delete-invalid-avatars/delete-invalid-avatars.go b/patches/delete-invalid-avatars/delete-invalid-avatars.go
new file mode 100644
index 00000000..58360437
--- /dev/null
+++ b/patches/delete-invalid-avatars/delete-invalid-avatars.go
@@ -0,0 +1,17 @@
+package main
+
+import (
+	"strings"
+
+	"github.com/animenotifier/arn"
+)
+
+func main() {
+	for user := range arn.MustStreamUsers() {
+		if !strings.HasPrefix(user.AvatarExtension, ".") {
+			user.AvatarExtension = ""
+		}
+
+		user.Save()
+	}
+}