diff --git a/fish-rust/src/history.rs b/fish-rust/src/history.rs
new file mode 100644
index 000000000..49f84af68
--- /dev/null
+++ b/fish-rust/src/history.rs
@@ -0,0 +1,8 @@
+use crate::env::{EnvMode, EnvStack};
+use crate::wchar::prelude::*;
+
+/// Sets private mode on. Once in private mode, it cannot be turned off.
+pub fn start_private_mode(vars: &EnvStack) {
+    vars.set_one(L!("fish_history"), EnvMode::GLOBAL, "".into());
+    vars.set_one(L!("fish_private_mode"), EnvMode::GLOBAL, "1".into());
+}
diff --git a/fish-rust/src/lib.rs b/fish-rust/src/lib.rs
index 0c20913a2..f65ed25d9 100644
--- a/fish-rust/src/lib.rs
+++ b/fish-rust/src/lib.rs
@@ -41,6 +41,7 @@
 mod future_feature_flags;
 mod global_safety;
 mod highlight;
+mod history;
 mod io;
 mod job_group;
 mod kill;