diff --git a/sat/tools/common/async_process.py b/sat/tools/common/async_process.py
index 9b29070c..ad69a461 100644
--- a/sat/tools/common/async_process.py
+++ b/sat/tools/common/async_process.py
@@ -131,6 +131,9 @@ class CommandProtocol(protocol.ProcessProtocol):
         else:
             command = cls.command
         cmd_args = [command] + args
+        if "env" not in kwargs:
+            # we pass parent environment by default
+            kwargs["env"] = None
         reactor.spawnProcess(prot,
                              command,
                              cmd_args,