diff --git a/configure.ac b/configure.ac
index 47c31bb..2364585 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,7 +35,7 @@
 AC_CHECK_HEADER(systemd/sd-bus.h, ,[AC_MSG_ERROR([Could not find systemd/sd-bus.h...systemd development package required])])
 
 # Checks for typedefs, structures, and compiler characteristics.
-AX_CXX_COMPILE_STDCXX_17([noext])
+AX_CXX_COMPILE_STDCXX([20],[noext])
 AX_APPEND_COMPILE_FLAGS([-flto -fPIC -Wall -Werror], [CXXFLAGS])
 AX_APPEND_COMPILE_FLAGS([-flto -fPIC -Wall -Werror], [CFLAGS])