diff --git a/local/patches/registry.json b/local/patches/registry.json
index cdeef99..b1a472d 100644
--- a/local/patches/registry.json
+++ b/local/patches/registry.json
@@ -8,5 +8,17 @@
     "makevars": {},
     "patch": "RcppParallel/disable-tbb.patch",
     "reason": "bundled Intel TBB build hangs/fails on musl (Alpine) and newer toolchains (g++ 15 on ubuntu-2604); patch unsets USE_TBB and forces -DRCPP_PARALLEL_USE_TBB=0 so RcppParallel skips the bundled build and uses the TinyThread backend"
+  },
+  {
+    "package": "rstan",
+    "versions": "*",
+    "platforms": ["*"],
+    "env": {},
+    "configure_args": [],
+    "makevars": {
+      "CPPFLAGS": "-DTBB_INTERFACE_NEW -I/usr/local/include"
+    },
+    "patch": null,
+    "reason": "StanHeaders' init_threadpool_tbb.hpp unconditionally includes the legacy <tbb/tbb_stddef.h> (removed in oneTBB 2021+) for version detection, breaking compilation of Module.cpp against the bundled oneTBB. Pre-defining TBB_INTERFACE_NEW skips that include and selects the modern tbb/global_control.h + tbb/task_arena.h path that the bundled TBB provides (-I/usr/local/include preserves the default CPPFLAGS the override replaces)"
   }
 ]