diff --git a/Tests/ExecutableFinderTest.php b/Tests/ExecutableFinderTest.php
index 47183e08..4a6c2c4b 100644
--- a/Tests/ExecutableFinderTest.php
+++ b/Tests/ExecutableFinderTest.php
@@ -148,7 +148,7 @@ public function testFindBatchExecutableOnWindows()
      */
     public function testEmptyDirInPath()
     {
-        putenv(sprintf('PATH=%s:', \dirname(\PHP_BINARY)));
+        putenv(sprintf('PATH=%s%s', \dirname(\PHP_BINARY), \PATH_SEPARATOR));
 
         try {
             touch('executable');