diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -55,7 +55,7 @@
   ;;
 esac
 dnl Require C++11 compiler (no GNU extensions)
-AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory], [nodefault])
+AX_CXX_COMPILE_STDCXX([14], [noext], [mandatory], [nodefault])
 dnl Check if -latomic is required for <std::atomic>
 CHECK_ATOMIC