diff --git a/tests/test_in_vterm/test_shells.sh b/tests/test_in_vterm/test_shells.sh
index b08b4e9e..d4d0eef3 100755
--- a/tests/test_in_vterm/test_shells.sh
+++ b/tests/test_in_vterm/test_shells.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 . tests/shlib/common.sh
 . tests/shlib/vterm.sh
 
diff --git a/tests/test_in_vterm/test_tmux.sh b/tests/test_in_vterm/test_tmux.sh
index 7e1deccf..d6cd6a51 100755
--- a/tests/test_in_vterm/test_tmux.sh
+++ b/tests/test_in_vterm/test_tmux.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 . tests/shlib/common.sh
 . tests/shlib/vterm.sh