diff --git a/ext/pdo_odbc/odbc_stmt.c b/ext/pdo_odbc/odbc_stmt.c
index bd4a2f6162d09..af0fc46b0ccdb 100644
--- a/ext/pdo_odbc/odbc_stmt.c
+++ b/ext/pdo_odbc/odbc_stmt.c
@@ -607,6 +607,19 @@ static int odbc_stmt_describe(pdo_stmt_t *stmt, int colno)
 		}
 	}
 	colsize = displaysize;
+	if ( S->cols[colno].coltype == SQL_WCHAR
+#ifdef SQL_WVARCHAR
+		|| S->cols[colno].coltype == SQL_WVARCHAR
+#endif
+#ifdef SQL_WLONGVARCHAR
+		|| S->cols[colno].coltype == SQL_WLONGVARCHAR
+#endif
+	) {
+		/* displaysize is counted by characters;
+		for unicode, each could take up to 4 bytes in UTF-8;
+		see https://www.rfc-editor.org/rfc/rfc3629 */
+		colsize = displaysize * 4;
+	}
 
 	col->maxlen = S->cols[colno].datalen = colsize;
 	col->name = zend_string_init(S->cols[colno].colname, colnamelen, 0);
diff --git a/ext/pdo_odbc/tests/gh9498_1.phpt b/ext/pdo_odbc/tests/gh9498_1.phpt
new file mode 100644
index 0000000000000..512f114d81d37
--- /dev/null
+++ b/ext/pdo_odbc/tests/gh9498_1.phpt
@@ -0,0 +1,87 @@
+--TEST--
+Bug GH-9498 (unicode string corruption during SELECT)
+--EXTENSIONS--
+pdo_odbc
+--SKIPIF--
+<?php
+require 'ext/pdo/tests/pdo_test.inc';
+PDOTest::skip();
+?>
+--FILE--
+<?php
+require 'ext/pdo/tests/pdo_test.inc';
+$db = PDOTest::test_factory(dirname(__FILE__) . '/common.phpt');
+$db->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
+
+$tests = [
+    [
+        "name" => "beamed_eighth_notes_binary_encoded_utf16le",
+        "expr" => "CAST(0x6b26 AS nvarchar(1))",
+        "expected_answer" => "♫",
+    ],
+    [
+        "name" => "beamed_eighth_notes_nchar",
+        "expr" => "NCHAR(0x266b)",
+        "expected_answer" => "♫",
+    ],
+    [
+        "name" => "beamed_eighth_notes_u+266b_constant",
+        "expr" => "N'♫'",
+        "expected_answer" => "♫",
+    ],
+    [
+        "name" => "ligature_fi_nchar",
+        "expr" => "NCHAR(0xfb01)",
+        "expected_answer" => "fi",
+    ],
+    [
+        "name" => "php_ascii_string_constant",
+        "expr" => "'php'",
+        "expected_answer" => "php",
+    ],
+    [
+        "name" => "php_unicode_string_constant",
+        "expr" => "N'php'",
+        "expected_answer" => "php",
+    ],
+    [
+        "name" => "pink_in_czech_binary_encoded_utf16le",
+        "expr" => "CAST(0x72006f017e016f007600fd00 AS nvarchar(6))",
+        "expected_answer" => "růžový",
+    ],
+    [
+        "name" => "pink_in_czech_unicode_string_constant",
+        "expr" => "N'růžový'",
+        "expected_answer" => "růžový",
+    ],
+    [
+        "name" => "segno_u+1d10b_constant",
+        "expr" => "N'𝄋'",
+        "expected_answer" => "𝄋",
+    ],
+];
+
+foreach ($tests as $t) {
+    print $t["name"] . ": ";
+    $sql = "SELECT " . $t["expr"] . ' AS "' . $t["name"] . '";';
+    $results = $db->query($sql, \PDO::FETCH_NUM)->fetch();
+    if ( $results[0] == $t["expected_answer"] ) {
+        print "PASS";
+    } else {
+        print "FAIL!";
+        print "\tresult: '" . $results[0] . "'";
+        print "\texpected: '" . $t["expected_answer"] . "'";
+    }
+    print "\n";
+}
+?>
+--EXPECT--
+beamed_eighth_notes_binary_encoded_utf16le: PASS
+beamed_eighth_notes_nchar: PASS
+beamed_eighth_notes_u+266b_constant: PASS
+ligature_fi_nchar: PASS
+php_ascii_string_constant: PASS
+php_unicode_string_constant: PASS
+pink_in_czech_binary_encoded_utf16le: PASS
+pink_in_czech_unicode_string_constant: PASS
+segno_u+1d10b_constant: PASS