diff --git a/schemars/src/lib.rs b/schemars/src/lib.rs
index 2eba2f9..bb189bb 100644
--- a/schemars/src/lib.rs
+++ b/schemars/src/lib.rs
@@ -1,3 +1,4 @@
+#![forbid(unsafe_code)]
 /*!
 Generate JSON Schema documents from Rust code
 
diff --git a/schemars_derive/src/lib.rs b/schemars_derive/src/lib.rs
index 7697011..d50a890 100644
--- a/schemars_derive/src/lib.rs
+++ b/schemars_derive/src/lib.rs
@@ -1,3 +1,5 @@
+#![forbid(unsafe_code)]
+
 #[macro_use]
 extern crate quote;
 #[macro_use]