diff --git a/src/Compilation.zig b/src/Compilation.zig
index 6291ce78d469424b7fc1d7966868d177d96e092b..43b16241fc714b579d4cfbbf991745f979ae7e57 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -1316,7 +1316,6 @@ pub fn create(gpa: Allocator, options: InitOptions) !*Compilation {
                 .local_zir_cache = local_zir_cache,
                 .emit_h = emit_h,
                 .error_name_list = .{},
-                .tmp_hack_arena = std.heap.ArenaAllocator.init(gpa),
             };
             try module.init();
 
diff --git a/src/Module.zig b/src/Module.zig
index dc9b9402bd9bda57e50cf957fec7898f4495198e..b718193abaa39ca6a5cdbf6e55e295c2889fc76f 100644
--- a/src/Module.zig
+++ b/src/Module.zig
@@ -98,10 +98,6 @@ string_literal_bytes: ArrayListUnmanaged(u8) = .{},
 
 /// Stores all Type and Value objects; periodically garbage collected.
 intern_pool: InternPool = .{},
-/// Temporarily used for some unfortunate allocations made by backends that need to construct
-/// pointer types that can't be represented by the InternPool. Once all types are migrated
-/// to be stored in the InternPool, this can be removed.
-tmp_hack_arena: std.heap.ArenaAllocator,
 
 /// The set of all the generic function instantiations. This is used so that when a generic
 /// function is called twice with the same comptime parameter arguments, both calls dispatch
@@ -3423,7 +3419,6 @@ pub fn deinit(mod: *Module) void {
     mod.string_literal_bytes.deinit(gpa);
 
     mod.intern_pool.deinit(gpa);
-    mod.tmp_hack_arena.deinit();
 }
 
 pub fn destroyDecl(mod: *Module, decl_index: Decl.Index) void {