diff --git a/mdformat_mkdocs/_normalize_list.py b/mdformat_mkdocs/_normalize_list.py
index b50fa1c..46cdba5 100644
--- a/mdformat_mkdocs/_normalize_list.py
+++ b/mdformat_mkdocs/_normalize_list.py
@@ -436,6 +436,11 @@ def parse_text(*, text: str, inc_numbers: bool, use_sem_break: bool) -> ParsedTe
 # Outputs string result
 
 
+def _strip_filler(text: str) -> str:
+    """Remove filler characters inserted during wrapping."""
+    return text.replace(f"{FILLER_CHAR} ", "").replace(FILLER_CHAR, "")
+
+
 def _join(*, new_lines: list[tuple[str, str]]) -> str:
     """Join ParsedText into a single string representation."""
     new_indents, new_contents = unzip(new_lines)
@@ -443,10 +448,7 @@ def _join(*, new_lines: list[tuple[str, str]]) -> str:
     new_indents_iter = new_indents
 
     # Remove filler characters added by inline formatting for 'wrap'
-    new_contents_iter = (
-        content.replace(f"{FILLER_CHAR} ", "").replace(FILLER_CHAR, "").rstrip()
-        for content in new_contents
-    )
+    new_contents_iter = (_strip_filler(content).rstrip() for content in new_contents)
 
     return "".join(
         f"{new_indent}{new_content}{EOL}"
@@ -470,7 +472,7 @@ def normalize_list(
     if node.level > 1:
         # Note: this function is called recursively,
         #   so only process the top-level item
-        return text
+        return _strip_filler(text)
 
     # Retrieve user-options
     inc_numbers = bool(get_conf(context.options, "number"))
diff --git a/tests/format/test_wrap.py b/tests/format/test_wrap.py
index 61ffe84..04d04cb 100644
--- a/tests/format/test_wrap.py
+++ b/tests/format/test_wrap.py
@@ -1,3 +1,5 @@
+from textwrap import dedent
+
 import mdformat
 import pytest
 
@@ -221,6 +223,38 @@ def gcd(a, b):
 ///
 """
 
+DEF_LIST_WITH_NESTED_WRAP = dedent(
+    """\
+    term
+
+    :   Definition starts with a paragraph, followed by an unordered list:
+
+        - Foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar.
+
+           - (3) bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar.
+
+                - foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar
+                  (split) foo bar foo bar foo bar foo bar.
+    """,
+)
+
+DEF_LIST_WITH_NESTED_WRAP_EXPECTED = dedent(
+    """\
+    term
+
+    :   Definition starts with a paragraph, followed by an unordered list:
+
+        - Foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar
+          foo bar foo bar foo bar foo bar.
+
+          - (3) bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar
+            foo bar foo bar foo bar foo bar.
+
+            - foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo bar foo
+              bar (split) foo bar foo bar foo bar foo bar.
+    """,
+)
+
 
 @pytest.mark.parametrize(
     ("text", "expected", "align_lists", "wrap"),
@@ -255,3 +289,13 @@ def test_wrap(text: str, expected: str, align_lists: bool, wrap: int):
     )
     print_text(output, expected)
     assert output.lstrip() == expected.lstrip()
+
+
+def test_definition_list_wrap_with_gfm():
+    output = mdformat.text(
+        DEF_LIST_WITH_NESTED_WRAP,
+        options={"wrap": 80},
+        extensions={"mkdocs", "gfm"},
+    )
+    print_text(output, DEF_LIST_WITH_NESTED_WRAP_EXPECTED)
+    assert output == DEF_LIST_WITH_NESTED_WRAP_EXPECTED