diff --git a/build-support/macros-and-definitions.cmake b/build-support/macros-and-definitions.cmake
index 840b9d415..d0259c036 100644
--- a/build-support/macros-and-definitions.cmake
+++ b/build-support/macros-and-definitions.cmake
@@ -723,6 +723,7 @@ macro(process_options)
     if(${EIGEN3_FOUND})
       set(ENABLE_EIGEN True)
       add_definitions(-DHAVE_EIGEN3)
+      add_definitions(-DEIGEN_MPL2_ONLY)
       include_directories(${EIGEN3_INCLUDE_DIR})
     else()
       message(${HIGHLIGHTED_STATUS} "Eigen was not found")