diff --git a/ext/gd/gd.c b/ext/gd/gd.c
index 84f1a82ef22..947b2c306ee 100644
--- a/ext/gd/gd.c
+++ b/ext/gd/gd.c
@@ -814,6 +814,7 @@ ZEND_BEGIN_ARG_INFO_EX(arginfo_imagefilter, 0, 0, 2)
 	ZEND_ARG_INFO(0, arg1)
 	ZEND_ARG_INFO(0, arg2)
 	ZEND_ARG_INFO(0, arg3)
+	ZEND_ARG_INFO(0, arg4)
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_INFO(arginfo_imageconvolution, 0)