diff --git a/src/Makevars.in b/src/Makevars.in
index 89918574..4b91fc49 100644
--- a/src/Makevars.in
+++ b/src/Makevars.in
@@ -1,3 +1,3 @@
 PKG_CPPFLAGS=-I../inst/include @cflags@ -DUCHAR_TYPE=wchar_t -DU_SHOW_CPLUSPLUS_API=0
-PKG_CXXFLAGS=$(C_VISIBILITY)
+PKG_CXXFLAGS=$(CXX_VISIBILITY)
 PKG_LIBS=@libs@