diff --git a/crates/oyster_builtin_proc/src/lib.rs b/crates/oyster_builtin_proc/src/lib.rs
index baec598..cb0de7d 100644
--- a/crates/oyster_builtin_proc/src/lib.rs
+++ b/crates/oyster_builtin_proc/src/lib.rs
@@ -1,3 +1,5 @@
+#![deny(unreachable_pub)]
+
 use darling::FromMeta;
 use proc_macro::TokenStream;
 use proc_macro2::Span;
diff --git a/crates/oyster_lineedit/src/lib.rs b/crates/oyster_lineedit/src/lib.rs
index 37efefb..854c159 100644
--- a/crates/oyster_lineedit/src/lib.rs
+++ b/crates/oyster_lineedit/src/lib.rs
@@ -1,3 +1,5 @@
+#![deny(unreachable_pub)]
+
 use std::io::{self, Write};
 
 pub fn readline(prompt: &str) -> Result<String, io::Error> {
diff --git a/crates/oyster_parser/src/lib.rs b/crates/oyster_parser/src/lib.rs
index b0b373f..1d8a525 100644
--- a/crates/oyster_parser/src/lib.rs
+++ b/crates/oyster_parser/src/lib.rs
@@ -1,3 +1,5 @@
+#![deny(unreachable_pub)]
+
 //! Parser for the oyster shell, the grammar is outlined below, `extras` are allowed everywhere,
 //! *except* inside `word`.
 //! `_` means that the rule does not produce an explicit node.
diff --git a/crates/oyster_runtime/src/lib.rs b/crates/oyster_runtime/src/lib.rs
index 5dd6e61..da4ba41 100644
--- a/crates/oyster_runtime/src/lib.rs
+++ b/crates/oyster_runtime/src/lib.rs
@@ -1,3 +1,5 @@
+#![deny(unreachable_pub)]
+
 //! The runtime for executing oyster programs.
 //! Panics when an invalid ast gets passed.