diff --git a/upb/reflection.c b/upb/reflection.c
index 481e3db943..695cae0513 100644
--- a/upb/reflection.c
+++ b/upb/reflection.c
@@ -67,7 +67,6 @@ static uint32_t *oneofcase(const upb_msg *msg,
 }
 
 static upb_msgval _upb_msg_getraw(const upb_msg *msg, const upb_fielddef *f) {
-  assert(f);
   const upb_msglayout_field *field = upb_fielddef_layout(f);
   const char *mem = PTR_AT(msg, field->offset, char);
   upb_msgval val = {0};