diff --git a/js/ajax.js b/js/ajax.js
index 0401cca7..f65c6c96 100644
--- a/js/ajax.js
+++ b/js/ajax.js
@@ -24,10 +24,12 @@ $(window).ready(function() {
             if (do_not_ajax)
                 return true;
 
-            // In the captcha is present, halt if it does not have a response..
-            if (captcha_renderer && postCaptchaId && !captcha_renderer.hasResponse(postCaptchaId)) {
-                captcha_renderer.execute(postCaptchaId);
-                return false;
+            // If the captcha is present, halt if it does not have a response.
+            if (captchaMode === 'static' || (captchaMode === 'dynamic' && isDynamicCaptchaEnabled())) {
+                if (captcha_renderer && postCaptchaId && !captcha_renderer.hasResponse(postCaptchaId)) {
+                    captcha_renderer.execute(postCaptchaId);
+                    return false;
+                }
             }
 
             var form = this;