diff --git a/plugins/Makefile b/plugins/Makefile
index 1836635..b2f75eb 100644
--- a/plugins/Makefile
+++ b/plugins/Makefile
@@ -1315,6 +1315,7 @@ endif
 
 RTNEURAL_FLAGS  = -std=gnu++17
 RTNEURAL_FLAGS += -DBiquad=AidaBiquad
+RTNEURAL_FLAGS += -DEigen=Aida_Eigen
 RTNEURAL_FLAGS += -Dconst_blas_data_mapper=Aida_const_blas_data_mapper
 RTNEURAL_FLAGS += -Devaluator=Aida_evaluator
 RTNEURAL_FLAGS += -DSKIP_MINGW_FORMAT