diff --git a/configure.ac b/configure.ac
index a911296..6c5ac70 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,7 +12,7 @@
 AC_PROG_INSTALL
 
 # Checks for typedefs, structures, and compiler characteristics.
-AX_CXX_COMPILE_STDCXX_14([noext])
+AX_CXX_COMPILE_STDCXX([17], [noext], [mandatory])
 AX_APPEND_COMPILE_FLAGS([-Wall -Werror], [CXXFLAGS])
 
 # For linking