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-rw-r--r--ext/mwrap/mwrap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/mwrap/mwrap.c b/ext/mwrap/mwrap.c
index a45bb38..826ca92 100644
--- a/ext/mwrap/mwrap.c
+++ b/ext/mwrap/mwrap.c
@@ -27,7 +27,7 @@ extern VALUE __attribute__((weak)) rb_yield(VALUE);
 static VALUE mwrap_dump(int argc, VALUE *argv, VALUE mod)
 {
         VALUE io, min;
-        struct dump_arg a;
+        struct dump_arg a = { .dump_csv = false };
         rb_io_t *fptr;
 
         rb_scan_args(argc, argv, "02", &io, &min);