diff --git a/test/functional/sqlsrv/sqlsrv_connect_driver.phpt b/test/functional/sqlsrv/sqlsrv_connect_driver.phpt
index b7b51ad6..db05578c 100644
--- a/test/functional/sqlsrv/sqlsrv_connect_driver.phpt
+++ b/test/functional/sqlsrv/sqlsrv_connect_driver.phpt
@@ -103,7 +103,7 @@ function testInvalidValues($msodbcsqlMaj, $server, $connectionOptions)
 function testEncryptedWithODBC($msodbcsqlMaj, $server, $connectionOptions)
 {
     // Skip this function if running outside Windows
-    if (!isWindows()) {
+    if (!(strtoupper(substr(PHP_OS, 0, 3)) === 'WIN')) {
         return;
     }