diff --git a/src/Makevars b/src/Makevars
index 7dac90b..db5f9c3 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -9,3 +9,4 @@ PKG_CXXFLAGS = -DNDEBUG
 PKG_CXXFLAGS = $(SHLIB_OPENMP_CXXFLAGS)
 PKG_LIBS = `$(R_HOME)/bin/Rscript -e "Rcpp:::LdFlags()"` $(SHLIB_OPENMP_CXXFLAGS) $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
 
+CXX_STD = CXX11
\ No newline at end of file
diff --git a/src/Makevars.win b/src/Makevars.win
index 4b15096..aa460b3 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -11,3 +11,4 @@ PKG_LIBS = $(shell "${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" --vanilla -e "Rcpp::
 
 PKG_CPPFLAGS = -I. -DNDEBUG
 
+CXX_STD = CXX11
\ No newline at end of file