diff --git a/src/Makevars b/src/Makevars
index 65ebb4c82..dca050344 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -1,3 +1 @@
-CXX_STD = CXX17
-
 PKG_CPPFLAGS = -I../inst/include
\ No newline at end of file
diff --git a/src/Makevars.win b/src/Makevars.win
index 4311440b3..dca050344 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -1,3 +1 @@
-CXX_STD = CXX14
-
 PKG_CPPFLAGS = -I../inst/include
\ No newline at end of file