diff --git a/test/cases/compile_errors/union_depends_on_pointer_alignment.zig b/test/cases/compile_errors/union_depends_on_pointer_alignment.zig
new file mode 100644
index 0000000000..2b97a3fb54
--- /dev/null
+++ b/test/cases/compile_errors/union_depends_on_pointer_alignment.zig
@@ -0,0 +1,11 @@
+const U = union {
+    next: ?*align(1) U align(128),
+};
+
+export fn entry() usize {
+    return @alignOf(U);
+}
+
+// error
+//
+// :1:11: error: union layout depends on being pointer aligned