diff --git a/src/Makevars b/src/Makevars
index d412b3f..07dfcab 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -1,2 +1,2 @@
-PKG_CXXFLAGS = -I../inst/include -D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION -w -O3 -Ofast
+PKG_CXXFLAGS = -I../inst/include -D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION
 CXXFLAGS= -O3 -Ofast