diff --git a/trytond/backend/postgresql/database.py b/trytond/backend/postgresql/database.py
index 07ad939dc7..4dfe2a4271 100644
--- a/trytond/backend/postgresql/database.py
+++ b/trytond/backend/postgresql/database.py
@@ -94,10 +94,10 @@ class Database(DatabaseInterface):
             cmd.append('--port=' + CONFIG['db_port'])
         cmd.append(database_name)
 
-        stdin, stdout = exec_pg_command_pipe(*tuple(cmd))
-        stdin.close()
-        data = stdout.read()
-        res = stdout.close()
+        pipe = exec_pg_command_pipe(*tuple(cmd))
+        pipe.stdin.close()
+        data = pipe.stdout.read()
+        res = pipe.wait()
         if res:
             raise Exception('Couldn\'t dump database!')
         return data
@@ -129,11 +129,11 @@ class Database(DatabaseInterface):
             args2.append(' ' + tmpfile)
             args2 = tuple(args2)
 
-        stdin, stdout = exec_pg_command_pipe(*args2)
+        pipe = exec_pg_command_pipe(*args2)
         if not os.name == "nt":
-            stdin.write(data)
-        stdin.close()
-        res = stdout.close()
+            pipe.stdin.write(data)
+        pipe.stdin.close()
+        res = pipe.wait()
         if res:
             raise Exception('Couldn\'t restore database')
 
diff --git a/trytond/tools/misc.py b/trytond/tools/misc.py
index 245a5b1b9d..1381c70c7c 100644
--- a/trytond/tools/misc.py
+++ b/trytond/tools/misc.py
@@ -63,7 +63,7 @@ def exec_pg_command_pipe(name, *args):
                             stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                             close_fds=True,
                             env=child_env)
-    return (pipe.stdin, pipe.stdout)
+    return pipe
 
 def exec_command_pipe(name, *args):
     prog = find_in_path(name)