diff --git a/winixd/Makefile b/winixd/Makefile
index b615ac1..a362318 100644
--- a/winixd/Makefile
+++ b/winixd/Makefile
@@ -27,7 +27,7 @@ endif
 #	CXX = g++-4.8
 
 ifndef CXXFLAGS
-CXXFLAGS = -Wall -O0 -g -fPIC -pthread -std=c++17 -I/usr/local/include -I/usr/include/postgresql -DEZC_HAS_SPECIAL_STREAM
+CXXFLAGS = -Wall -O0 -g -fPIC -pthread -std=c++20 -I/usr/local/include -I/usr/include/postgresql -DEZC_HAS_SPECIAL_STREAM
 endif
 
 ifndef AR