diff --git a/plugins/generic/filesystem.py b/plugins/generic/filesystem.py
index 058192642..cb6dc82b1 100644
--- a/plugins/generic/filesystem.py
+++ b/plugins/generic/filesystem.py
@@ -39,8 +39,8 @@ class Filesystem:
         if Backend.isDbms(DBMS.MYSQL):
             lengthQuery = "SELECT LENGTH(LOAD_FILE('%s'))" % remoteFile
 
-        elif Backend.isDbms(DBMS.PGSQL):
-                lengthQuery = "SELECT LENGTH(data) FROM pg_largeobject WHERE loid=%d" % self.oid
+        elif Backend.isDbms(DBMS.PGSQL) and not fileRead:
+            lengthQuery = "SELECT LENGTH(data) FROM pg_largeobject WHERE loid=%d" % self.oid
 
         elif Backend.isDbms(DBMS.MSSQL):
             self.createSupportTbl(self.fileTblName, self.tblField, "VARBINARY(MAX)")