diff --git a/lib/std/special/test_runner.zig b/lib/std/special/test_runner.zig
index f4c8c6de9d7ed79beb52f2671e38c652d2aff010..426715163825936c2077cdf0afc384f7aef7b83b 100644
--- a/lib/std/special/test_runner.zig
+++ b/lib/std/special/test_runner.zig
@@ -23,7 +23,7 @@ pub fn main() anyerror!void {
 
     var leaks: usize = 0;
     for (test_fn_list) |test_fn, i| {
-        std.testing.allocator_instance = std.heap.GeneralPurposeAllocator(.{}){};
+        std.testing.allocator_instance = .{};
         defer {
             if (std.testing.allocator_instance.deinit()) {
                 leaks += 1;