diff --git a/math/openfst/files/patch-src_include_fst_fst.h b/math/openfst/files/patch-src_include_fst_fst.h
new file mode 100644
index 000000000000..a8d162fa3668
--- /dev/null
+++ b/math/openfst/files/patch-src_include_fst_fst.h
@@ -0,0 +1,13 @@
+--- src/include/fst/fst.h.orig	2026-03-22 05:51:04 UTC
++++ src/include/fst/fst.h
+@@ -652,8 +652,8 @@ class FstImpl {
+   FstImpl &operator=(const FstImpl<Arc> &impl) {
+     properties_ = impl.properties_;
+     type_ = impl.type_;
+-    isymbols_ = impl.isymbols_ ? impl.isymbols_->Copy() : nullptr;
+-    osymbols_ = impl.osymbols_ ? impl.osymbols_->Copy() : nullptr;
++    isymbols_.reset(impl.isymbols_ ? impl.isymbols_->Copy() : nullptr);
++    osymbols_.reset(impl.osymbols_ ? impl.osymbols_->Copy() : nullptr);
+     return *this;
+   }
+