diff --git a/source/config/mh-msys-msvc b/source/config/mh-msys-msvc
index 6f50798..2a669b3 100644
--- a/source/config/mh-msys-msvc
+++ b/source/config/mh-msys-msvc
@@ -54,7 +54,7 @@ endif
 # -D_CRT_SECURE_NO_DEPRECATE is needed to quiet warnings about using standard C functions.
 # -utf-8 set source file encoding to utf-8.
 CFLAGS+=-GF -nologo -utf-8
-CXXFLAGS+=-GF -nologo -EHsc -Zc:wchar_t -utf-8
+CXXFLAGS+=-GF -nologo -EHsc -Zc:wchar_t -utf-8 -std:c++17
 CPPFLAGS+=-D_CRT_SECURE_NO_DEPRECATE
 DEFS+=-DWIN32 -DCYGWINMSVC
 LDFLAGS+=-nologo
@@ -90,8 +90,6 @@ LIBSICU = $(STATIC_PREFIX)$(ICUPREFIX)
 A = lib
 
 # Cygwin's ar can't handle Win64 right now. So we use Microsoft's tool instead.
-AR = LIB.EXE#M#
-ARFLAGS := -nologo $(ARFLAGS:r=)#M#
 RANLIB = ls -s#M#
 AR_OUTOPT = -OUT:#M#