diff --git a/plugins/OptionalManager/ContentDbPlugin.py b/plugins/OptionalManager/ContentDbPlugin.py
index 961a7390..f03ed4bb 100644
--- a/plugins/OptionalManager/ContentDbPlugin.py
+++ b/plugins/OptionalManager/ContentDbPlugin.py
@@ -343,6 +343,12 @@ class ContentDbPlugin(object):
             limit_bytes = float(re.sub("[^0-9.]", "", config.optional_limit)) * 1024 * 1024 * 1024
         return limit_bytes
 
+    def getOptionalUsedBytes(self):
+        size = self.execute("SELECT SUM(size) FROM file_optional WHERE is_downloaded = 1 AND is_pinned = 0").fetchone()[0]
+        if not size:
+            size = 0
+        return size
+
     def getOptionalNeedDelete(self, size):
         if config.optional_limit.endswith("%"):
             limit_percent = float(re.sub("[^0-9.]", "", config.optional_limit))
@@ -359,9 +365,7 @@ class ContentDbPlugin(object):
             self.log.debug("Invalid limit for optional files: %s" % limit)
             return False
 
-        size = self.execute("SELECT SUM(size) FROM file_optional WHERE is_downloaded = 1 AND is_pinned = 0").fetchone()[0]
-        if not size:
-            size = 0
+        size = self.getOptionalUsedBytes()
 
         need_delete = self.getOptionalNeedDelete(size)