diff --git a/src/Makevars.in b/src/Makevars.in
index 7a04454..6a26be9 100644
--- a/src/Makevars.in
+++ b/src/Makevars.in
@@ -1,5 +1,5 @@
 CXX_STD = CXX20
 
-PKG_CPPFLAGS = @RCPP_PARALLEL_CPPFLAGS@
+PKG_CPPFLAGS = @RCPP_PARALLEL_CPPFLAGS@ -DARMA_NO_DEBUG
 
 PKG_LIBS = $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS) @RCPP_PARALLEL_LIBS@