diff --git a/cmake/onnx.cmake b/cmake/onnx.cmake
index 7a6d17f..03882b2 100644
--- a/cmake/onnx.cmake
+++ b/cmake/onnx.cmake
@@ -18,6 +18,8 @@ macro(configure_onnx)
             )
         file(WRITE ${ONNX_CMAKELISTS} "${content}")
     endif()
+    set(ONNX_BUILD_MAIN_LIB ON)
+    add_compile_definitions(ONNX_BUILD_MAIN_LIB)
     set(ONNX_NAMESPACE ${DAQ_ONNX_NAMESPACE} CACHE STRING "onnx namespace")
     add_subdirectory(${PROJECT_SOURCE_DIR}/third_party/onnx)
     # Since https://github.com/onnx/onnx/pull/1318 is merged, we don't need to set it manually