diff --git a/src/lib.rs b/src/lib.rs
index 8407a97..c3e4cd5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,4 @@
-#![warn(missing_docs)]
+#![deny(missing_docs)]
 
 //! Compression and decompression of the upkr format and variants.
 //!