diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index c7aee66f068..580c3fc2cb2 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -30338,13 +30338,14 @@ alias_ctad_tweaks (tree tmpl, tree uguides)
      any).  */
 
   enum { alias, inherited } ctad_kind;
-  tree atype, fullatparms, utype;
+  tree atype, fullatparms, utype, name;
   if (TREE_CODE (tmpl) == TEMPLATE_DECL)
     {
       ctad_kind = alias;
       atype = TREE_TYPE (tmpl);
       fullatparms = DECL_TEMPLATE_PARMS (tmpl);
       utype = DECL_ORIGINAL_TYPE (DECL_TEMPLATE_RESULT (tmpl));
+      name = dguide_name (tmpl);
     }
   else
     {
@@ -30352,6 +30353,8 @@ alias_ctad_tweaks (tree tmpl, tree uguides)
       atype = NULL_TREE;
       fullatparms = TREE_PURPOSE (tmpl);
       utype = TREE_VALUE (tmpl);
+      name = dguide_name (TPARMS_PRIMARY_TEMPLATE
+			  (INNERMOST_TEMPLATE_PARMS (fullatparms)));
     }
 
   tsubst_flags_t complain = tf_warning_or_error;
@@ -30447,6 +30450,7 @@ alias_ctad_tweaks (tree tmpl, tree uguides)
 	    }
 	  if (g == error_mark_node)
 	    continue;
+	  DECL_NAME (g) = name;
 	  if (nfparms == 0)
 	    {
 	      /* The targs are all non-dependent, so g isn't a template.  */
diff --git a/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias22.C b/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias22.C
new file mode 100644
index 00000000000..9c6c841166a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias22.C
@@ -0,0 +1,14 @@
+// PR c++/115198
+// { dg-do compile { target c++20 } }
+
+template<bool B, class T>
+struct C {
+  C() = default;
+  C(const C&) = default;
+};
+
+template<class T>
+using A = C<false, T>;
+
+C<false, int> c;
+A a = c; // { dg-bogus "ambiguous" }