1 files changed, 4 insertions, 0 deletions

diff --git a/regress/assert.c b/regress/assert.c
index ebf0652..caa5725 100644
--- a/regress/assert.c
+++ b/regress/assert.c
@@ -216,12 +216,16 @@ empty_assert_tests(void)
         fido_dev_io_t io_f;
         int i;
 
+        memset(&io_f, 0, sizeof(io_f));
+
         a = alloc_assert();
         d = alloc_dev();
+
         io_f.open = dummy_open;
         io_f.close = dummy_close;
         io_f.read = dummy_read;
         io_f.write = dummy_write;
+
         assert(fido_dev_set_io_functions(d, &io_f) == FIDO_OK);
 
         empty_assert(d, a, 0);