diff --git a/Cargo.toml b/Cargo.toml
index a8055c746..da77631cd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -185,7 +185,6 @@ localize-messages = ["dep:fish-gettext"]
 gettext-extract = ["dep:fish-gettext-extraction"]
 
 # The following features are auto-detected by the build-script and should not be enabled manually.
-asan = []
 tsan = []
 
 [workspace.lints]
diff --git a/build_tools/lsan_suppressions.txt b/build_tools/lsan_suppressions.txt
index 4b1ffd56e..e69de29bb 100644
--- a/build_tools/lsan_suppressions.txt
+++ b/build_tools/lsan_suppressions.txt
@@ -1,3 +0,0 @@
-# LSAN can detect leaks tracing back to __asan::AsanThread::ThreadStart (probably caused by our
-# threads not exiting before their TLS dtors are called). Just ignore it.
-leak:AsanThread
diff --git a/cmake/Rust.cmake b/cmake/Rust.cmake
index 521da0c03..0be10db9c 100644
--- a/cmake/Rust.cmake
+++ b/cmake/Rust.cmake
@@ -6,7 +6,6 @@ set(FISH_RUST_BUILD_DIR "${CMAKE_BINARY_DIR}/cargo")
 
 if(DEFINED ASAN)
     list(APPEND CARGO_FLAGS "-Z" "build-std")
-    list(APPEND FISH_CARGO_FEATURES_LIST "asan")
 endif()
 if(DEFINED TSAN)
     list(APPEND CARGO_FLAGS "-Z" "build-std")
diff --git a/src/panic.rs b/src/panic.rs
index b7b7423f8..8cd05e011 100644
--- a/src/panic.rs
+++ b/src/panic.rs
@@ -12,7 +12,7 @@
 use crate::{
     common::{get_program_name, read_blocked},
     nix::isatty,
-    threads::{asan_maybe_exit, is_main_thread},
+    threads::is_main_thread,
 };
 
 pub static AT_EXIT: OnceLock<Box<dyn Fn() + Send + Sync>> = OnceLock::new();
@@ -59,6 +59,5 @@ pub fn panic_handler(main: impl FnOnce() -> i32 + UnwindSafe) -> ! {
     if let Some(at_exit) = AT_EXIT.get() {
         (at_exit)();
     }
-    asan_maybe_exit(exit_status);
     std::process::exit(exit_status)
 }
diff --git a/src/threads/threads.rs b/src/threads/threads.rs
index eca17bcf7..3c6509458 100644
--- a/src/threads/threads.rs
+++ b/src/threads/threads.rs
@@ -178,18 +178,6 @@ pub fn spawn<F: FnOnce() + Send + 'static>(callback: F) -> bool {
     result
 }
 
-/// Exits calling onexit handlers if running under ASAN, otherwise does nothing.
-///
-/// This function is always defined but is a no-op if not running under ASAN. This is to make it
-/// more ergonomic to call it in general and also makes it possible to call it via ffi at all.
-pub fn asan_maybe_exit(code: i32) {
-    if cfg!(feature = "asan") {
-        unsafe {
-            libc::exit(code);
-        }
-    }
-}
-
 /// Data shared between the thread pool [`ThreadPool`] and worker threads [`WorkerThread`].
 #[derive(Default)]
 struct ThreadPoolProtected {