diff --git a/lib/std/heap.zig b/lib/std/heap.zig
index 18fec1197f..cc8693f650 100644
--- a/lib/std/heap.zig
+++ b/lib/std/heap.zig
@@ -13,7 +13,6 @@ pub const ArenaAllocator = @import("heap/ArenaAllocator.zig");
 pub const SmpAllocator = @import("heap/SmpAllocator.zig");
 pub const FixedBufferAllocator = @import("heap/FixedBufferAllocator.zig");
 pub const PageAllocator = @import("heap/PageAllocator.zig");
-pub const ThreadSafeAllocator = @import("heap/ThreadSafeAllocator.zig");
 pub const WasmAllocator = if (builtin.single_threaded) BrkAllocator else @compileError("unimplemented");
 pub const BrkAllocator = @import("heap/BrkAllocator.zig");
 
@@ -1009,7 +1008,6 @@ test {
     _ = ArenaAllocator;
     _ = GeneralPurposeAllocator;
     _ = FixedBufferAllocator;
-    _ = ThreadSafeAllocator;
     if (builtin.single_threaded) {
         if (builtin.cpu.arch.isWasm() or (builtin.os.tag == .linux and !builtin.link_libc)) {
             _ = brk_allocator;
diff --git a/lib/std/heap/ThreadSafeAllocator.zig b/lib/std/heap/ThreadSafeAllocator.zig
deleted file mode 100644
index 6999213937..0000000000
--- a/lib/std/heap/ThreadSafeAllocator.zig
+++ /dev/null
@@ -1,62 +0,0 @@
-//! Deprecated. Thread safety should be built into each Allocator instance
-//! directly rather than trying to do this "composable allocators" thing.
-const ThreadSafeAllocator = @This();
-
-const std = @import("../std.zig");
-const Io = std.Io;
-const Allocator = std.mem.Allocator;
-
-child_allocator: Allocator,
-io: Io,
-mutex: Io.Mutex = .init,
-
-pub fn allocator(self: *ThreadSafeAllocator) Allocator {
-    return .{
-        .ptr = self,
-        .vtable = &.{
-            .alloc = alloc,
-            .resize = resize,
-            .remap = remap,
-            .free = free,
-        },
-    };
-}
-
-fn alloc(ctx: *anyopaque, n: usize, alignment: std.mem.Alignment, ra: usize) ?[*]u8 {
-    const self: *ThreadSafeAllocator = @ptrCast(@alignCast(ctx));
-    const io = self.io;
-    self.mutex.lockUncancelable(io);
-    defer self.mutex.unlock(io);
-
-    return self.child_allocator.rawAlloc(n, alignment, ra);
-}
-
-fn resize(ctx: *anyopaque, buf: []u8, alignment: std.mem.Alignment, new_len: usize, ret_addr: usize) bool {
-    const self: *ThreadSafeAllocator = @ptrCast(@alignCast(ctx));
-    const io = self.io;
-
-    self.mutex.lockUncancelable(io);
-    defer self.mutex.unlock(io);
-
-    return self.child_allocator.rawResize(buf, alignment, new_len, ret_addr);
-}
-
-fn remap(context: *anyopaque, memory: []u8, alignment: std.mem.Alignment, new_len: usize, return_address: usize) ?[*]u8 {
-    const self: *ThreadSafeAllocator = @ptrCast(@alignCast(context));
-    const io = self.io;
-
-    self.mutex.lockUncancelable(io);
-    defer self.mutex.unlock(io);
-
-    return self.child_allocator.rawRemap(memory, alignment, new_len, return_address);
-}
-
-fn free(ctx: *anyopaque, buf: []u8, alignment: std.mem.Alignment, ret_addr: usize) void {
-    const self: *ThreadSafeAllocator = @ptrCast(@alignCast(ctx));
-    const io = self.io;
-
-    self.mutex.lockUncancelable(io);
-    defer self.mutex.unlock(io);
-
-    return self.child_allocator.rawFree(buf, alignment, ret_addr);
-}