diff --git a/html/syntax/speculative-parsing/generated/document-write/meta-charset-script-src.tentative.sub.html b/html/syntax/speculative-parsing/generated/document-write/meta-charset-script-src.tentative.sub.html
index a2361168c65b00..d1264371eec061 100644
--- a/html/syntax/speculative-parsing/generated/document-write/meta-charset-script-src.tentative.sub.html
+++ b/html/syntax/speculative-parsing/generated/document-write/meta-charset-script-src.tentative.sub.html
@@ -20,6 +20,6 @@
      document.write('<plaintext>');
     <\/script>
     <\!-- speculative case in document.write -->
-    <meta charset=windows-1254><script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid=${uuid}&amp;encodingcheck=&Gbreve;"><\/script>
+    <meta\ charset=windows-1254><script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid=${uuid}&amp;encodingcheck=&Gbreve;"><\/script>
   `);
 </script>
diff --git a/html/syntax/speculative-parsing/tools/generate.py b/html/syntax/speculative-parsing/tools/generate.py
index bbdbc719f327e7..eb7b647869bb9c 100755
--- a/html/syntax/speculative-parsing/tools/generate.py
+++ b/html/syntax/speculative-parsing/tools/generate.py
@@ -550,7 +550,7 @@ def generate_tests(testcase, tentative):
         encoding_decl = f"<meta charset={encoding}>"
 
     html_testcase_markup = template_testcase_markup.format(url_wptserve_sub)
-    js_testcase_markup = template_testcase_markup.format(url_js_sub).replace(u"</script>", u"<\/script>")
+    js_testcase_markup = template_testcase_markup.format(url_js_sub).replace(u"</script>", u"<\/script>").replace(u"<meta charset", u"<meta\ charset")
 
     if test_nonspeculative is u'true':
         nonspeculative = template_nonspeculative.format(preamble=preamble, encoding_decl=encoding_decl, title=title, testcase_markup=html_testcase_markup, delay=delay)