diff --git a/lib/std/json.zig b/lib/std/json.zig
index 830f492e74..bb59b4e0f3 100644
--- a/lib/std/json.zig
+++ b/lib/std/json.zig
@@ -1657,6 +1657,9 @@ test "parse into tagged union" {
 }
 
 test "parseFree descends into tagged union" {
+    // tagged unions are broken on arm64: https://github.com/ziglang/zig/issues/4492
+    if (std.builtin.arch == .aarch64) return error.SkipZigTest;
+
     var fail_alloc = testing.FailingAllocator.init(testing.allocator, 1);
     const options = ParseOptions{ .allocator = &fail_alloc.allocator };
     const T = union(enum) {