diff --git a/src/calibre/ebooks/oeb/polish/tests/structure.py b/src/calibre/ebooks/oeb/polish/tests/structure.py
index 0e370aac5f..fa53d6d808 100644
--- a/src/calibre/ebooks/oeb/polish/tests/structure.py
+++ b/src/calibre/ebooks/oeb/polish/tests/structure.py
@@ -248,6 +248,9 @@ class Structure(BaseTest):
 
             '<p>One</p> Two. Three <p>Four':
             '<body><p><span id="1">One</span></p><span id="2"> Two. </span><span id="3">Three </span><p><span id="4">Four</span></p>',
+
+            '<p>Here is some <b>bold, </b><i>italic, </i><u>underline, </u> text.':
+            '<body><p><span id="1">Here is some <b>bold, </b><i>italic, </i><u>underline, </u> text.</span></p>',
         }.items()):
             root = parse(text, namespace_elements=True)
             orig = normalize_markup(root)
diff --git a/src/calibre/ebooks/oeb/polish/tts.py b/src/calibre/ebooks/oeb/polish/tts.py
index 1c073e2409..f5572ebac9 100644
--- a/src/calibre/ebooks/oeb/polish/tts.py
+++ b/src/calibre/ebooks/oeb/polish/tts.py
@@ -171,10 +171,12 @@ def mark_sentences_in_html(root, lang: str = '', voice: str = '') -> list[Senten
                     w.append(c)
                     first_child = c
                 if in_range:
-                    if last_child is not first_child:
-                        w.append(last_child)
                     if c is last_child:
+                        if last_child is not first_child:
+                            w.append(c)
                         break
+                    else:
+                        w.append(c)
             self.replace_reference_to_child(last_child, w)
             return w
 
