diff --git a/src/lib.rs b/src/lib.rs
index 77988bc..744cf59 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -157,6 +157,7 @@
 
 #![deny(unsafe_code)]
 #![deny(missing_docs)]
+#![deny(warnings)]
 #![no_std]
 
 extern crate embedded_hal as hal;
diff --git a/tests/ds3231.rs b/tests/ds3231.rs
index d4ef9cd..8504292 100644
--- a/tests/ds3231.rs
+++ b/tests/ds3231.rs
@@ -1,3 +1,5 @@
+#[deny(warnings)]
+
 extern crate embedded_hal_mock as hal;
 extern crate ds323x;
 use ds323x::Ds323x;
diff --git a/tests/ds3232.rs b/tests/ds3232.rs
index 0249814..ec80ae4 100644
--- a/tests/ds3232.rs
+++ b/tests/ds3232.rs
@@ -1,3 +1,5 @@
+#[deny(warnings)]
+
 extern crate embedded_hal_mock as hal;
 extern crate ds323x;
 use ds323x::Ds323x;
diff --git a/tests/ds3234.rs b/tests/ds3234.rs
index cc3631c..1516fad 100644
--- a/tests/ds3234.rs
+++ b/tests/ds3234.rs
@@ -1,3 +1,5 @@
+#[deny(warnings)]
+
 extern crate embedded_hal_mock as hal;
 extern crate ds323x;
 use ds323x::Ds323x;
diff --git a/tests/ds323x.rs b/tests/ds323x.rs
index 4e62e51..42360fa 100644
--- a/tests/ds323x.rs
+++ b/tests/ds323x.rs
@@ -1,3 +1,5 @@
+#[deny(warnings)]
+
 extern crate embedded_hal_mock as hal;
 use hal::i2c::Transaction as I2cTrans;
 use hal::spi::Transaction as SpiTrans;