diff --git a/ext/fileinfo/fileinfo.c b/ext/fileinfo/fileinfo.c
index cc272062822..5609b260155 100644
--- a/ext/fileinfo/fileinfo.c
+++ b/ext/fileinfo/fileinfo.c
@@ -187,7 +187,7 @@ PHP_FUNCTION(finfo_open)
 	char resolved_path[MAXPATHLEN];
 	zend_error_handling zeh;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|lp", &options, &file, &file_len) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|lp!", &options, &file, &file_len) == FAILURE) {
 		RETURN_THROWS();
 	}
 
diff --git a/ext/fileinfo/fileinfo.stub.php b/ext/fileinfo/fileinfo.stub.php
index 76f0444428e..5a9d346c7c3 100644
--- a/ext/fileinfo/fileinfo.stub.php
+++ b/ext/fileinfo/fileinfo.stub.php
@@ -5,7 +5,7 @@
 class finfo
 {
     /** @alias finfo_open */
-    public function __construct(int $flags = FILEINFO_NONE, string $magic_database = "") {}
+    public function __construct(int $flags = FILEINFO_NONE, ?string $magic_database = null) {}
 
     /**
      * @param resource|null $context
@@ -28,7 +28,7 @@ class finfo
     public function set_flags(int $flags) {}
 }
 
-function finfo_open(int $flags = FILEINFO_NONE, string $magic_database = ""): finfo|false {}
+function finfo_open(int $flags = FILEINFO_NONE, ?string $magic_database = null): finfo|false {}
 
 function finfo_close(finfo $finfo): bool {}
 
diff --git a/ext/fileinfo/fileinfo_arginfo.h b/ext/fileinfo/fileinfo_arginfo.h
index 6648c6074cc..2ae31e7b711 100644
--- a/ext/fileinfo/fileinfo_arginfo.h
+++ b/ext/fileinfo/fileinfo_arginfo.h
@@ -1,9 +1,9 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 6b31c20139e3360cb7ff692cc0d5ccfbfd3812bb */
+ * Stub hash: 2cd166d444d7324a9fe70170db434c05ccfbf386 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX(arginfo_finfo_open, 0, 0, finfo, MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, flags, IS_LONG, 0, "FILEINFO_NONE")
-	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, magic_database, IS_STRING, 0, "\"\"")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, magic_database, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_finfo_close, 0, 1, _IS_BOOL, 0)
@@ -35,7 +35,7 @@ ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_finfo___construct, 0, 0, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, flags, IS_LONG, 0, "FILEINFO_NONE")
-	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, magic_database, IS_STRING, 0, "\"\"")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, magic_database, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_finfo_file, 0, 0, 1)