diff --git a/pendulum/formatting/formatter.py b/pendulum/formatting/formatter.py
index 9c9b3404..9b64fcd6 100644
--- a/pendulum/formatting/formatter.py
+++ b/pendulum/formatting/formatter.py
@@ -33,7 +33,7 @@
     "['a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+"
     r"|[\u0600-\u06FF/]+(\s*?[\u0600-\u06FF]+){1,2}"
 )
-_MATCH_TIMEZONE = "[A-za-z0-9-+]+(/[A-Za-z0-9-+_]+)?"
+_MATCH_TIMEZONE = "[A-Za-z0-9-+]+(/[A-Za-z0-9-+_]+)?"
 
 
 class Formatter:
diff --git a/tests/datetime/test_from_format.py b/tests/datetime/test_from_format.py
index 7f1d03ec..0949332c 100644
--- a/tests/datetime/test_from_format.py
+++ b/tests/datetime/test_from_format.py
@@ -36,6 +36,13 @@ def test_from_format_with_timezone():
     assert "Europe/London" == d.timezone_name
 
 
+def test_from_format_with_square_bracket_in_timezone():
+    with pytest.raises(ValueError, match="^String does not match format"):
+        pendulum.from_format(
+            "1975-05-21 22:32:11 Eu[rope/London", "YYYY-MM-DD HH:mm:ss z",
+        )
+
+
 def test_from_format_with_escaped_elements():
     d = pendulum.from_format("1975-05-21T22:32:11+00:00", "YYYY-MM-DD[T]HH:mm:ssZ")
     assert_datetime(d, 1975, 5, 21, 22, 32, 11)