diff --git a/ext/gettext/tests/bug53251.phpt b/ext/gettext/tests/bug53251.phpt
index 6f37642925d..d568be6bc07 100644
--- a/ext/gettext/tests/bug53251.phpt
+++ b/ext/gettext/tests/bug53251.phpt
@@ -8,18 +8,28 @@ if (getenv('SKIP_REPEAT')) die('skip gettext leaks global state across requests'
 ?>
 --FILE--
 <?php
-var_dump(is_string(bindtextdomain('foo', null)));
+$results[] = is_string(bindtextdomain('foo', null));
 $dir = bindtextdomain('foo', '.');
-var_dump(bindtextdomain('foo', null) === $dir);
+$results[] = bindtextdomain('foo', null) === $dir;
+$results[] = bind_textdomain_codeset('foo', null);
+$results[] = bind_textdomain_codeset('foo', 'UTF-8');
+$results[] = bind_textdomain_codeset('foo', null);
 
-var_dump(bind_textdomain_codeset('foo', null));
-var_dump(bind_textdomain_codeset('foo', 'UTF-8'));
-var_dump(bind_textdomain_codeset('foo', null));
+$expected = [true, true, false, "UTF-8", "UTF-8"];
 
+// musl's bindtextdomain() has no default directory to return when
+// "foo" is unbound, so in the first call, you will get false instead
+// of a string.
+//
+// bind_textdomain_codeset() always returns false on musl
+// because musl only supports UTF-8. For more information:
+//
+//   * https://github.com/php/doc-en/issues/4311,
+//   * https://github.com/php/php-src/issues/17163
+//
+$expected_musl = [false, true, false, false, false];
+
+var_dump($results === $expected || $results === $expected_musl);
 ?>
 --EXPECT--
 bool(true)
-bool(true)
-bool(false)
-string(5) "UTF-8"
-string(5) "UTF-8"
diff --git a/ext/gettext/tests/gettext_bind_textdomain_codeset-retval.phpt b/ext/gettext/tests/gettext_bind_textdomain_codeset-retval.phpt
index 47c821648fc..941bab79bff 100644
--- a/ext/gettext/tests/gettext_bind_textdomain_codeset-retval.phpt
+++ b/ext/gettext/tests/gettext_bind_textdomain_codeset-retval.phpt
@@ -5,13 +5,21 @@ gettext
 --FILE--
 <?php
     var_dump(bind_textdomain_codeset(false,false));
-    var_dump(bind_textdomain_codeset('messages', "UTF-8"));
+
+    // bind_textdomain_codeset() always returns false on musl
+    // because musl only supports UTF-8. For more information:
+    //
+    //   * https://github.com/php/doc-en/issues/4311,
+    //   * https://github.com/php/php-src/issues/17163
+    //
+    $result = bind_textdomain_codeset('messages', "UTF-8");
+    var_dump($result === false || $result === "UTF-8");
 
     echo "Done\n";
 ?>
 --EXPECT--
 bool(false)
-string(5) "UTF-8"
+bool(true)
 Done
 --CREDITS--
 Florian Holzhauer fh-pt@fholzhauer.de