diff --git a/build.zig b/build.zig
index e121850221bcc15277e7cee471c851c1c5dedf76..faf14cc4052250ca76498b9e43db3343c385bef0 100644
--- a/build.zig
+++ b/build.zig
@@ -40,12 +40,11 @@ pub fn build(b: *std.Build) !void {
     });
     docgen_exe.single_threaded = single_threaded;
 
-    const rel_zig_exe = try b.build_root.join(b.allocator, &.{b.zig_exe});
     const langref_out_path = try b.cache_root.join(b.allocator, &.{"langref.html"});
     const docgen_cmd = docgen_exe.run();
     docgen_cmd.addArgs(&[_][]const u8{
         "--zig",
-        rel_zig_exe,
+        b.zig_exe,
         "doc" ++ fs.path.sep_str ++ "langref.html.in",
         langref_out_path,
     });