diff --git a/ext/pcntl/pcntl.c b/ext/pcntl/pcntl.c
index d040f96889ee8..c2b7f390fcafd 100644
--- a/ext/pcntl/pcntl.c
+++ b/ext/pcntl/pcntl.c
@@ -1295,7 +1295,7 @@ PHP_FUNCTION(pcntl_forkx)
 	zend_long flags;
 	pid_t pid;
 
-	ZEND_PARSE_PARAMETERS_START(1, 2)
+	ZEND_PARSE_PARAMETERS_START(1, 1)
 		Z_PARAM_LONG(flags)
 	ZEND_PARSE_PARAMETERS_END();