diff --git a/ext/spl/spl_directory.c b/ext/spl/spl_directory.c
index 0a4d1456d65e9..16bb6a11e5218 100644
--- a/ext/spl/spl_directory.c
+++ b/ext/spl/spl_directory.c
@@ -306,6 +306,11 @@ static void spl_filesystem_dir_open(spl_filesystem_object* intern, zend_string *
 	intern->type = SPL_FS_DIR;
 	intern->u.dir.dirp = php_stream_opendir(ZSTR_VAL(path), REPORT_ERRORS, FG(default_context));
 
+	if (intern->u.dir.dirp) {
+		/* we prevent potential UAF with conflicting explicit fclose(), relying on the object destructor for this */
+		intern->u.dir.dirp->flags |= PHP_STREAM_FLAG_NO_FCLOSE;
+	}
+
 	if (ZSTR_LEN(path) > 1 && IS_SLASH_AT(ZSTR_VAL(path), ZSTR_LEN(path)-1)) {
 		intern->path = zend_string_init(ZSTR_VAL(path), ZSTR_LEN(path)-1, 0);
 	} else {
diff --git a/ext/spl/tests/gh20678.phpt b/ext/spl/tests/gh20678.phpt
new file mode 100644
index 0000000000000..243f8cef06d16
--- /dev/null
+++ b/ext/spl/tests/gh20678.phpt
@@ -0,0 +1,14 @@
+--TEST--
+GH-20678 (resource created by GlobalIterator crashes when it is called with fclose())
+--CREDITS--
+chongwick
+--FILE--
+<?php
+$iter = new GlobIterator(__DIR__ . '/*.abcdefghij');
+$resources = get_resources();
+$resource = end($resources);
+fclose($resource);
+?>
+--EXPECTF--
+
+Warning: fclose(): %d is not a valid stream resource in %s on line %d