diff --git a/src/ossia_setup.cmake b/src/ossia_setup.cmake
index 43ec883889e..dc4a290eb31 100644
--- a/src/ossia_setup.cmake
+++ b/src/ossia_setup.cmake
@@ -10,6 +10,7 @@ target_compile_definitions(ossia
   PUBLIC
     RAPIDJSON_HAS_STDSTRING=1
     TINYSPLINE_DOUBLE_PRECISION
+    BOOST_NO_RTTI=1
     BOOST_MATH_DISABLE_FLOAT128=1
     BOOST_ASIO_DISABLE_CONCEPTS=1       # TODO boostorg/asio#312
     $<$<CONFIG:Debug>:BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING>