diff --git a/plugins/postgresql/index.py b/plugins/postgresql/index.py
index 0f9cf5971..edc7bda28 100755
--- a/plugins/postgresql/index.py
+++ b/plugins/postgresql/index.py
@@ -124,7 +124,7 @@ def getDbPort():
 
 
 def getSocketFile():
-    sock_name = 's.PGSQL.' + getDbPort()
+    sock_name = '.s.PGSQL.' + getDbPort()
     sock_tmp = '/tmp/' + sock_name
     if os.path.exists(sock_tmp):
         return sock_tmp