diff --git a/tests/unit_tests/openvpn/test_pkcs11.c b/tests/unit_tests/openvpn/test_pkcs11.c
index 5518fa15..3fe3e460 100644
--- a/tests/unit_tests/openvpn/test_pkcs11.c
+++ b/tests/unit_tests/openvpn/test_pkcs11.c
@@ -273,6 +273,8 @@ init(void **state)
 
         assert_int_equal(ftruncate(cert_fd, 0), 0);
         assert_int_equal(ftruncate(key_fd, 0), 0);
+        assert_int_equal(lseek(cert_fd, 0, SEEK_SET), 0);
+        assert_int_equal(lseek(key_fd, 0, SEEK_SET), 0);
         num_certs++;
     }