exclude flexible array size with old compilers

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61814 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/file.c b/file.c
index 5947b3f68b..7fdca684cc 100644
--- a/file.c
+++ b/file.c
@@ -388,7 +388,7 @@ apply2files(int (*func)(const char *, void *), int argc, VALUE *argv, void *arg)
 {
     VALUE v;
     const size_t size = sizeof(struct apply_filename);
-    const long len = (long)(sizeof(struct apply_arg) + (size * argc));
+    const long len = (long)(offsetof(struct apply_arg, fn) + (size * argc));
     struct apply_arg *aa = ALLOCV(v, len);
 
     aa->errnum = 0;