diff --git a/src/machine.rs b/src/machine.rs
index 6a7cbe58711..369bb92c6f3 100644
--- a/src/machine.rs
+++ b/src/machine.rs
@@ -28,7 +28,7 @@ use rustc_span::Symbol;
 use rustc_target::abi::Size;
 use rustc_target::spec::abi::Abi;
 
-use crate::{shims::posix::FileHandler, *};
+use crate::{shims::unix::FileHandler, *};
 
 // Some global facts about the emulated machine.
 pub const PAGE_SIZE: u64 = 4 * 1024; // FIXME: adjust to target architecture
@@ -266,9 +266,9 @@ pub struct Evaluator<'mir, 'tcx> {
     pub(crate) enforce_abi: bool,
 
     /// The table of file descriptors.
-    pub(crate) file_handler: shims::posix::FileHandler,
+    pub(crate) file_handler: shims::unix::FileHandler,
     /// The table of directory descriptors.
-    pub(crate) dir_handler: shims::posix::DirHandler,
+    pub(crate) dir_handler: shims::unix::DirHandler,
 
     /// The "time anchor" for this machine's monotone clock (for `Instant` simulation).
     pub(crate) time_anchor: Instant,
diff --git a/src/shims/dlsym.rs b/src/shims/dlsym.rs
index 05296d3a4eb..c5081582281 100644
--- a/src/shims/dlsym.rs
+++ b/src/shims/dlsym.rs
@@ -2,13 +2,13 @@ use rustc_middle::mir;
 use rustc_target::spec::abi::Abi;
 
 use crate::*;
-use shims::posix::dlsym as posix;
+use shims::unix::dlsym as unix;
 use shims::windows::dlsym as windows;
 
 #[derive(Debug, Copy, Clone)]
 #[allow(non_camel_case_types)]
 pub enum Dlsym {
-    Posix(posix::Dlsym),
+    Posix(unix::Dlsym),
     Windows(windows::Dlsym),
 }
 
@@ -18,7 +18,7 @@ impl Dlsym {
     pub fn from_str<'tcx>(name: &[u8], target_os: &str) -> InterpResult<'tcx, Option<Dlsym>> {
         let name = &*String::from_utf8_lossy(name);
         Ok(match target_os {
-            "linux" | "macos" => posix::Dlsym::from_str(name, target_os)?.map(Dlsym::Posix),
+            "linux" | "macos" => unix::Dlsym::from_str(name, target_os)?.map(Dlsym::Posix),
             "windows" => windows::Dlsym::from_str(name)?.map(Dlsym::Windows),
             os => bug!("dlsym not implemented for target_os {}", os),
         })
@@ -38,7 +38,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
         let this = self.eval_context_mut();
         match dlsym {
             Dlsym::Posix(dlsym) =>
-                posix::EvalContextExt::call_dlsym(this, dlsym, abi, args, dest, ret),
+                unix::EvalContextExt::call_dlsym(this, dlsym, abi, args, dest, ret),
             Dlsym::Windows(dlsym) =>
                 windows::EvalContextExt::call_dlsym(this, dlsym, abi, args, dest, ret),
         }
diff --git a/src/shims/foreign_items.rs b/src/shims/foreign_items.rs
index e978391801f..12b5b40e69e 100644
--- a/src/shims/foreign_items.rs
+++ b/src/shims/foreign_items.rs
@@ -702,7 +702,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
 
             // Platform-specific shims
             _ => match this.tcx.sess.target.os.as_ref() {
-                "linux" | "macos" => return shims::posix::foreign_items::EvalContextExt::emulate_foreign_item_by_name(this, link_name, abi, args, dest, ret),
+                "linux" | "macos" => return shims::unix::foreign_items::EvalContextExt::emulate_foreign_item_by_name(this, link_name, abi, args, dest, ret),
                 "windows" => return shims::windows::foreign_items::EvalContextExt::emulate_foreign_item_by_name(this, link_name, abi, args, dest, ret),
                 target => throw_unsup_format!("the target `{}` is not supported", target),
             }
diff --git a/src/shims/mod.rs b/src/shims/mod.rs
index 926fcd5d040..cdffe2f65b4 100644
--- a/src/shims/mod.rs
+++ b/src/shims/mod.rs
@@ -1,7 +1,7 @@
 mod backtrace;
 pub mod foreign_items;
 pub mod intrinsics;
-pub mod posix;
+pub mod unix;
 pub mod windows;
 
 pub mod dlsym;
diff --git a/src/shims/posix/dlsym.rs b/src/shims/unix/dlsym.rs
similarity index 94%
rename from src/shims/posix/dlsym.rs
rename to src/shims/unix/dlsym.rs
index 339110467c7..578ae488a98 100644
--- a/src/shims/posix/dlsym.rs
+++ b/src/shims/unix/dlsym.rs
@@ -2,8 +2,8 @@ use rustc_middle::mir;
 use rustc_target::spec::abi::Abi;
 
 use crate::*;
-use shims::posix::linux::dlsym as linux;
-use shims::posix::macos::dlsym as macos;
+use shims::unix::linux::dlsym as linux;
+use shims::unix::macos::dlsym as macos;
 
 #[derive(Debug, Copy, Clone)]
 pub enum Dlsym {
diff --git a/src/shims/posix/foreign_items.rs b/src/shims/unix/foreign_items.rs
similarity index 98%
rename from src/shims/posix/foreign_items.rs
rename to src/shims/unix/foreign_items.rs
index 566befb0efd..32cf7e6f891 100644
--- a/src/shims/posix/foreign_items.rs
+++ b/src/shims/unix/foreign_items.rs
@@ -10,9 +10,9 @@ use rustc_target::spec::abi::Abi;
 
 use crate::*;
 use shims::foreign_items::EmulateByNameResult;
-use shims::posix::fs::EvalContextExt as _;
-use shims::posix::sync::EvalContextExt as _;
-use shims::posix::thread::EvalContextExt as _;
+use shims::unix::fs::EvalContextExt as _;
+use shims::unix::sync::EvalContextExt as _;
+use shims::unix::thread::EvalContextExt as _;
 
 impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
@@ -477,8 +477,8 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
             // Platform-specific shims
             _ => {
                 match this.tcx.sess.target.os.as_ref() {
-                    "linux" => return shims::posix::linux::foreign_items::EvalContextExt::emulate_foreign_item_by_name(this, link_name, abi, args, dest, ret),
-                    "macos" => return shims::posix::macos::foreign_items::EvalContextExt::emulate_foreign_item_by_name(this, link_name, abi, args, dest, ret),
+                    "linux" => return shims::unix::linux::foreign_items::EvalContextExt::emulate_foreign_item_by_name(this, link_name, abi, args, dest, ret),
+                    "macos" => return shims::unix::macos::foreign_items::EvalContextExt::emulate_foreign_item_by_name(this, link_name, abi, args, dest, ret),
                     _ => unreachable!(),
                 }
             }
diff --git a/src/shims/posix/fs.rs b/src/shims/unix/fs.rs
similarity index 100%
rename from src/shims/posix/fs.rs
rename to src/shims/unix/fs.rs
diff --git a/src/shims/posix/linux/dlsym.rs b/src/shims/unix/linux/dlsym.rs
similarity index 100%
rename from src/shims/posix/linux/dlsym.rs
rename to src/shims/unix/linux/dlsym.rs
diff --git a/src/shims/posix/linux/foreign_items.rs b/src/shims/unix/linux/foreign_items.rs
similarity index 98%
rename from src/shims/posix/linux/foreign_items.rs
rename to src/shims/unix/linux/foreign_items.rs
index f966c63b723..7a9c687fcd7 100644
--- a/src/shims/posix/linux/foreign_items.rs
+++ b/src/shims/unix/linux/foreign_items.rs
@@ -4,10 +4,10 @@ use rustc_target::spec::abi::Abi;
 
 use crate::*;
 use shims::foreign_items::EmulateByNameResult;
-use shims::posix::fs::EvalContextExt as _;
-use shims::posix::linux::sync::futex;
-use shims::posix::sync::EvalContextExt as _;
-use shims::posix::thread::EvalContextExt as _;
+use shims::unix::fs::EvalContextExt as _;
+use shims::unix::linux::sync::futex;
+use shims::unix::sync::EvalContextExt as _;
+use shims::unix::thread::EvalContextExt as _;
 
 impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
diff --git a/src/shims/posix/linux/mod.rs b/src/shims/unix/linux/mod.rs
similarity index 100%
rename from src/shims/posix/linux/mod.rs
rename to src/shims/unix/linux/mod.rs
diff --git a/src/shims/posix/linux/sync.rs b/src/shims/unix/linux/sync.rs
similarity index 100%
rename from src/shims/posix/linux/sync.rs
rename to src/shims/unix/linux/sync.rs
diff --git a/src/shims/posix/macos/dlsym.rs b/src/shims/unix/macos/dlsym.rs
similarity index 100%
rename from src/shims/posix/macos/dlsym.rs
rename to src/shims/unix/macos/dlsym.rs
diff --git a/src/shims/posix/macos/foreign_items.rs b/src/shims/unix/macos/foreign_items.rs
similarity index 98%
rename from src/shims/posix/macos/foreign_items.rs
rename to src/shims/unix/macos/foreign_items.rs
index 7f6393fd30f..a1adfa0d2fd 100644
--- a/src/shims/posix/macos/foreign_items.rs
+++ b/src/shims/unix/macos/foreign_items.rs
@@ -4,8 +4,8 @@ use rustc_target::spec::abi::Abi;
 
 use crate::*;
 use shims::foreign_items::EmulateByNameResult;
-use shims::posix::fs::EvalContextExt as _;
-use shims::posix::thread::EvalContextExt as _;
+use shims::unix::fs::EvalContextExt as _;
+use shims::unix::thread::EvalContextExt as _;
 
 impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
diff --git a/src/shims/posix/macos/mod.rs b/src/shims/unix/macos/mod.rs
similarity index 100%
rename from src/shims/posix/macos/mod.rs
rename to src/shims/unix/macos/mod.rs
diff --git a/src/shims/posix/mod.rs b/src/shims/unix/mod.rs
similarity index 100%
rename from src/shims/posix/mod.rs
rename to src/shims/unix/mod.rs
diff --git a/src/shims/posix/sync.rs b/src/shims/unix/sync.rs
similarity index 100%
rename from src/shims/posix/sync.rs
rename to src/shims/unix/sync.rs
diff --git a/src/shims/posix/thread.rs b/src/shims/unix/thread.rs
similarity index 100%
rename from src/shims/posix/thread.rs
rename to src/shims/unix/thread.rs