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-rw-r--r--libio/iopopen.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libio/iopopen.c b/libio/iopopen.c
index dc1e74d3eb..5703c99d47 100644
--- a/libio/iopopen.c
+++ b/libio/iopopen.c
@@ -123,7 +123,7 @@ DEFUN(_IO_proc_open, (fp, command, mode),
 	  proc_file_chain = proc_file_chain->next;
 	}
 
-      _IO_execl("/bin/sh", "sh", "-c", command, NULL);
+      _IO_execl("/bin/sh", "sh", "-c", command, (char *) 0);
       _IO__exit(127);
     }
   _IO_close(child_end);