diff --git a/cmake/deps/Boost.cmake b/cmake/deps/Boost.cmake
index 80c652f0ac..3b4e165dcf 100644
--- a/cmake/deps/Boost.cmake
+++ b/cmake/deps/Boost.cmake
@@ -55,13 +55,20 @@ endif()
 # stack-use-after-scope errors. BOOST_USE_UCONTEXT ensures the ucontext backend
 # is selected (fcontext does not support ASAN annotations).
 # These defines must match what Boost was compiled with (see conan/profiles/sanitizers).
-# TSAN also requires the ucontext backend so that Boost.Context uses
-# POSIX ucontext (not fcontext assembly) for fiber switching. This
-# allows TSAN to properly track context switches and avoids false positives.
-# These defines must match what Boost was compiled with (see conan/profiles/sanitizers).
-if(enable_asan OR enable_tsan)
+if(enable_asan)
     target_compile_definitions(
         xrpl_boost
         INTERFACE BOOST_USE_ASAN BOOST_USE_UCONTEXT
     )
 endif()
+
+# TSAN also requires the ucontext backend so that Boost.Context uses
+# POSIX ucontext (not fcontext assembly) for fiber switching. This
+# allows TSAN to properly track context switches and avoids false positives.
+# These defines must match what Boost was compiled with (see conan/profiles/sanitizers).
+if(enable_tsan)
+    target_compile_definitions(
+        xrpl_boost
+        INTERFACE BOOST_USE_TSAN BOOST_USE_UCONTEXT
+    )
+endif()