diff --git a/subst.c b/subst.c

index 1dbfb5e..049962e 100644

--- a/subst.c

+++ b/subst.c

@@ -5011,7 +5011,8 @@ process_substitute (string, open_for_read_in_child)

 #if defined (JOB_CONTROL)

   old_pipeline_pgrp = pipeline_pgrp;

-  pipeline_pgrp = shell_pgrp;

+  if (pipeline_pgrp == 0 || (subshell_environment & (SUBSHELL_PIPE|SUBSHELL_FORK|SUBSHELL_ASYNC)) == 0)

+    pipeline_pgrp = shell_pgrp;

   save_pipeline (1);

 #endif /* JOB_CONTROL */

-- 

2.9.3