diff --git a/src/Makevars b/src/Makevars
index 81ef7dc..46c98e9 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -1,3 +1,3 @@
-CXX_STD = CXX11
+CXX_STD = CXX14
 
 PKG_CPPFLAGS = -I../inst/include -DBOOST_NO_AUTO_PTR
diff --git a/src/Makevars.win b/src/Makevars.win
index 81ef7dc..46c98e9 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -1,3 +1,3 @@
-CXX_STD = CXX11
+CXX_STD = CXX14
 
 PKG_CPPFLAGS = -I../inst/include -DBOOST_NO_AUTO_PTR