diff --git a/gcc/testsuite/lib/g++-dg.exp b/gcc/testsuite/lib/g++-dg.exp
index 59e8081a29d..9bf63a1392a 100644
--- a/gcc/testsuite/lib/g++-dg.exp
+++ b/gcc/testsuite/lib/g++-dg.exp
@@ -53,7 +53,16 @@ proc g++-dg-runtest { testcases flags default-extra-flags } {
 	    if { [llength $gpp_std_list] > 0 } {
 		set std_list $gpp_std_list
 	    } else {
-		set std_list { 98 14 17 20 }
+		# If the test requires a newer C++ version than which
+		# is tested by default, use that C++ version for that
+		# single test.  This should be updated or commented
+		# out whenever the default std_list is updated or newer
+		# C++ effective target is added.
+		if [search_for $test "{ dg-do * { target c++23 } }"] {
+		    set std_list { 23 }
+		} else {
+		    set std_list { 98 14 17 20 }
+		}
 	    }
 	    set option_list { }
 	    foreach x $std_list {