diff --git a/CHANGES.md b/CHANGES.md
index 90f815ec..64bdc16a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,7 @@
## python-markdown2 2.5.6 (not yet released)
+- [pull #745] Fix `footnotes` extra listing notes in definition order, so a note's position in the list didn't match its number in the text (#178)
- [pull #739] Fix `header-ids` extra putting sanitized HTML into header ids in safe mode, which allowed attribute injection (#649)
- [pull #732] Fix excessive CPU use in the inline HTML tokenizer on repeated unclosed tag fragments (#707)
- [pull #736] Clarify how to enable file variables in the Python API and command-line help (#269, #365).
diff --git a/lib/markdown2.py b/lib/markdown2.py
index 66d49a69..f052314b 100755
--- a/lib/markdown2.py
+++ b/lib/markdown2.py
@@ -2272,10 +2272,8 @@ def _add_footnotes(self, text: str) -> str:
if not self.footnote_return_symbol:
self.footnote_return_symbol = "↩"
- # self.footnotes is generated in _strip_footnote_definitions, which runs re.sub on the whole
- # text. This means that the dict keys are inserted in order of appearance. Use the dict to
- # sort footnote ids by that same order
- self.footnote_ids.sort(key=lambda a: list(self.footnotes.keys()).index(a))
+ # self.footnote_ids is filled by _do_footnote_marker in the order the references are
+ # numbered, so listing the notes in that order keeps each note at its number
for i, id in enumerate(self.footnote_ids):
if i != 0:
footer.append('')
diff --git a/test/tm-cases/footnotes_defined_out_of_order.html b/test/tm-cases/footnotes_defined_out_of_order.html
new file mode 100644
index 00000000..480ee16d
--- /dev/null
+++ b/test/tm-cases/footnotes_defined_out_of_order.html
@@ -0,0 +1,22 @@
+The first reference and the second.
+
+
+ A quoted reference.
+
+
+
diff --git a/test/tm-cases/footnotes_defined_out_of_order.opts b/test/tm-cases/footnotes_defined_out_of_order.opts
new file mode 100644
index 00000000..9dfee9e2
--- /dev/null
+++ b/test/tm-cases/footnotes_defined_out_of_order.opts
@@ -0,0 +1 @@
+{"extras": ["footnotes"]}
diff --git a/test/tm-cases/footnotes_defined_out_of_order.text b/test/tm-cases/footnotes_defined_out_of_order.text
new file mode 100644
index 00000000..3fb2bbaf
--- /dev/null
+++ b/test/tm-cases/footnotes_defined_out_of_order.text
@@ -0,0 +1,7 @@
+The first reference[^b] and the second[^a].
+
+> A quoted reference[^c].
+
+[^a]: Defined first, referenced second.
+[^c]: Defined second, referenced third.
+[^b]: Defined third, referenced first.
diff --git a/test/tm-cases/repeated_footnote_labels.html b/test/tm-cases/repeated_footnote_labels.html
index 201708f0..7b99a2f2 100644
--- a/test/tm-cases/repeated_footnote_labels.html
+++ b/test/tm-cases/repeated_footnote_labels.html
@@ -9,12 +9,12 @@