diff --git a/src/Makevars.in b/src/Makevars.in
index c8b0fc0..37ccd21 100644
--- a/src/Makevars.in
+++ b/src/Makevars.in
@@ -1,5 +1,3 @@
-CXX_STD = CXX14
-
 PKG_CPPFLAGS = -Ilib -DFMT_HEADER_ONLY
 
 all: clean
diff --git a/src/Makevars.ucrt b/src/Makevars.ucrt
index ab6bc69..860f08e 100644
--- a/src/Makevars.ucrt
+++ b/src/Makevars.ucrt
@@ -1,5 +1,3 @@
-CXX_STD = CXX14
-
 PKG_CPPFLAGS = -Ilib \
 	-DFMT_HEADER_ONLY \
 	-DHTTPGD_DEBUG_DEVICE
diff --git a/src/Makevars.win b/src/Makevars.win
index 4284390..75d704d 100644
--- a/src/Makevars.win
+++ b/src/Makevars.win
@@ -1,5 +1,3 @@
-CXX_STD = CXX14
-
 VERSION_HARFBUZZ = 2.7.4
 
 RWINLIB_HARFBUZZ = ../windows/harfbuzz-${VERSION_HARFBUZZ}