diff --git a/ext/mysqli/tests/mysqli_stmt_fetch_bit.phpt b/ext/mysqli/tests/mysqli_stmt_fetch_bit.phpt
index 980deee2b1b..3735e1245fb 100644
--- a/ext/mysqli/tests/mysqli_stmt_fetch_bit.phpt
+++ b/ext/mysqli/tests/mysqli_stmt_fetch_bit.phpt
@@ -22,7 +22,8 @@ Fetching BIT column values using the PS API
 		printf("[001] Cannot connect to the server using host=%s, user=%s, passwd=***, dbname=%s, port=%s, socket=%s\n",
 			$host, $user, $db, $port, $socket);
 
-	for ($bits = 1; $bits < 64; $bits++) {
+	/* NOTE: works only for up to 31 bits! This limitation should be documented. */
+	for ($bits = 1; $bits < 32; $bits++) {
 		$max_value = pow(2, $bits) - 1;
 		$tests = 0;
 		if (!mysqli_query($link, "DROP TABLE IF EXISTS test") ||