diff --git a/configure.ac b/configure.ac
index d7621ac01..4f4fb6432 100644
--- a/configure.ac
+++ b/configure.ac
@@ -376,6 +376,7 @@ AC_SUBST(CFG_CXXFLAGS_WEXTRA)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_COROUTINES,-fcoroutines-ts)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_COROUTINES,-fcoroutines)
 _MY_CXX_CHECK_SET(CFG_CXXFLAGS_COROUTINES,-fcoroutines-ts -Wno-deprecated-experimental-coroutine)
+_MY_CXX_CHECK_SET(CFG_CXXFLAGS_COROUTINES,-std=gnu++20)
 AC_SUBST(CFG_CXXFLAGS_COROUTINES)
 
 # HAVE_COROUTINES