diff --git a/plugins/git/git_commit_behind b/plugins/git/git_commit_behind
index 759fd902..e77d3ed3 100755
--- a/plugins/git/git_commit_behind
+++ b/plugins/git/git_commit_behind
@@ -177,7 +177,7 @@ def generate_git_command(repo_conf, git_command):
             quote(repo_conf['path']),
             quote(conf['git_path']),
             ' '.join(git_command))
-        cmd = ['su', '-', repo_conf['user'], '-c', shell_cmd]
+        cmd = ['su', '-', repo_conf['user'], '-s', '/bin/sh', '-c', shell_cmd]
     return cmd