Fixed one missing argument in updated Constructor
diff --git a/mesonbuild/compilers/objc.py b/mesonbuild/compilers/objc.py
index 9114f93..548a6db 100644
--- a/mesonbuild/compilers/objc.py
+++ b/mesonbuild/compilers/objc.py
@@ -92,6 +92,7 @@
                 'C language standard to use',
                 ['none', 'c89', 'c99', 'c11', 'c17', 'gnu99', 'gnu11'],
                 'none',
+                'std',
             )
         })
         return opts