diff --git a/src/main.rs b/src/main.rs
index 3ab3a0e..287f0a9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+#![cfg_attr(test, deny(warnings))]
+
 #[macro_use]
 extern crate diesel;