diff --git a/plugin/kcaptcha/kcaptcha.lib.php b/plugin/kcaptcha/kcaptcha.lib.php
index f52db1544..511d0352d 100644
--- a/plugin/kcaptcha/kcaptcha.lib.php
+++ b/plugin/kcaptcha/kcaptcha.lib.php
@@ -240,10 +240,10 @@ function captcha_html($class="captcha")
     $html .= "\n".'<script src="'.G5_CAPTCHA_URL.'/kcaptcha.js"></script>';
     $html .= "\n".'<fieldset id="captcha" class="'.$class.'">';
     $html .= "\n".'<legend><label for="captcha_key">자동등록방지</label></legend>';
-    if (G5_IS_MOBILE) $html .= '<audio src="#" id="captcha_audio" controls></audio>';
+    if (is_mobile()) $html .= '<audio src="#" id="captcha_audio" controls></audio>';
     //$html .= "\n".'<img src="#" alt="" id="captcha_img">';
     $html .= "\n".'<img src="javascript:void(0);" alt="" id="captcha_img">';
-    if (!G5_IS_MOBILE) $html .= "\n".'<button type="button" id="captcha_mp3"><span></span>숫자음성듣기</button>';
+    if (!is_mobile()) $html .= "\n".'<button type="button" id="captcha_mp3"><span></span>숫자음성듣기</button>';
     $html .= "\n".'<button type="button" id="captcha_reload"><span></span>새로고침</button>';
     $html .= '<input type="text" name="captcha_key" id="captcha_key" required class="captcha_box required" size="6" maxlength="6">';
     $html .= "\n".'<span id="captcha_info">자동등록방지 숫자를 순서대로 입력하세요.</span>';