diff --git a/CHANGES.md b/CHANGES.md
index 10aabd33..e5c183e6 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,7 @@
 
 ## python-markdown2 2.5.6 (not yet released)
 
+- [pull #777] Give each reference to a repeated footnote its own id instead of repeating `fnref-<id>`
 - [pull #762] Speed up documents with many links by skipping the backslash-escape scan for text without a backslash
 - [pull #748] Speed up `_unescape_special_chars` by skipping text with no hashes and dropping the full-text comparison per pass (#635)
 - [pull #749] URL-encode destinations generated by the `link-patterns` extra (#55)
diff --git a/lib/markdown2.py b/lib/markdown2.py
index d6285404..84f1c92a 100755
--- a/lib/markdown2.py
+++ b/lib/markdown2.py
@@ -427,6 +427,7 @@ def _setup_extras(self):
             self.footnotes = OrderedDict()
             self.footnote_ids = []
             self._footnote_numbers = {}
+            self._footnote_ref_counts = {}
             self._footnote_marker = _hash_text('<<footnote>>')
         if "header-ids" in self.extras:
             if not hasattr(self, '_count_from_header_id') or self.extras['header-ids'].get('reset-count', False):
@@ -598,6 +599,15 @@ def footnote_sub(match):
                 )
             return str(self._footnote_numbers[normed_id])
 
+        def footnote_ref_id_sub(match):
+            # Every reference needs its own id. The first one in the document keeps `fnref-<id>`,
+            # which the footnote's back link points to, and later ones get `fnref2-<id>` and so on.
+            normed_id = match.group(1)
+            count = self._footnote_ref_counts.get(normed_id, 0) + 1
+            self._footnote_ref_counts[normed_id] = count
+            return 'fnref-%s' % normed_id if count == 1 else 'fnref%d-%s' % (count, normed_id)
+
+        text = re.sub(r'%s-ref-([^"]*)' % self._footnote_marker, footnote_ref_id_sub, text)
         return re.sub(r'%s-(.*?)(?=</a></sup>)' % self._footnote_marker, footnote_sub, text)
 
     @mark_stage(Stage.POSTPROCESS)
@@ -3373,7 +3383,7 @@ def run(self, text: str):
                 normed_id = re.sub(r'\W', '-', link_text[1:])
                 if normed_id in self.md.footnotes:
                     result = (
-                        f'<sup class="footnote-ref" id="fnref-{normed_id}">'
+                        f'<sup class="footnote-ref" id="{self.md._footnote_marker}-ref-{normed_id}">'
                         # insert special footnote marker that's easy to find and match against later
                         f'<a href="#fn-{normed_id}">{self.md._footnote_marker}-{normed_id}</a></sup>'
                     )
diff --git a/test/tm-cases/repeated_footnote_labels.html b/test/tm-cases/repeated_footnote_labels.html
index 201708f0..0ceae2c0 100644
--- a/test/tm-cases/repeated_footnote_labels.html
+++ b/test/tm-cases/repeated_footnote_labels.html
@@ -1,16 +1,16 @@
-<p>First<sup class="footnote-ref" id="fnref-first"><a href="#fn-first">1</a></sup>, second<sup class="footnote-ref" id="fnref-second"><a href="#fn-second">2</a></sup>, and first again<sup class="footnote-ref" id="fnref-first"><a href="#fn-first">1</a></sup>.</p>
+<p>First<sup class="footnote-ref" id="fnref-first"><a href="#fn-first">1</a></sup>, second<sup class="footnote-ref" id="fnref-second"><a href="#fn-second">2</a></sup>, and first again<sup class="footnote-ref" id="fnref2-first"><a href="#fn-first">1</a></sup>.</p>
 
 <ul>
-<li>Second again<sup class="footnote-ref" id="fnref-second"><a href="#fn-second">2</a></sup>.</li>
+<li>Second again<sup class="footnote-ref" id="fnref2-second"><a href="#fn-second">2</a></sup>.</li>
 <li>Third<sup class="footnote-ref" id="fnref-third"><a href="#fn-third">3</a></sup>.</li>
-<li>First again<sup class="footnote-ref" id="fnref-first"><a href="#fn-first">1</a></sup>.</li>
+<li>First again<sup class="footnote-ref" id="fnref3-first"><a href="#fn-first">1</a></sup>.</li>
 </ul>
 
 <div class="footnotes">
 <hr />
 <ol>
 <li id="fn-second">
-<p>Second note referencing first<sup class="footnote-ref" id="fnref-first"><a href="#fn-first">1</a></sup>.&#160;<a href="#fnref-second" class="footnoteBackLink" title="Jump back to footnote 1 in the text.">&#8617;</a></p>
+<p>Second note referencing first<sup class="footnote-ref" id="fnref4-first"><a href="#fn-first">1</a></sup>.&#160;<a href="#fnref-second" class="footnoteBackLink" title="Jump back to footnote 1 in the text.">&#8617;</a></p>
 </li>
 
 <li id="fn-first">
@@ -18,7 +18,7 @@
 </li>
 
 <li id="fn-third">
-<p>Third note referencing second<sup class="footnote-ref" id="fnref-second"><a href="#fn-second">2</a></sup>.&#160;<a href="#fnref-third" class="footnoteBackLink" title="Jump back to footnote 3 in the text.">&#8617;</a></p>
+<p>Third note referencing second<sup class="footnote-ref" id="fnref3-second"><a href="#fn-second">2</a></sup>.&#160;<a href="#fnref-third" class="footnoteBackLink" title="Jump back to footnote 3 in the text.">&#8617;</a></p>
 </li>
 </ol>
 </div>