diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-using6.C b/gcc/testsuite/g++.dg/cpp2a/concepts-using6.C
new file mode 100644
index 000000000000..a40519a30dae
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-using6.C
@@ -0,0 +1,20 @@
+// PR c++/121351
+// { dg-do compile { target c++20 } }
+
+template<class T> concept C = true;
+
+template<class T>
+struct A {
+  template<class U> void f(U) requires C<T>; // #1
+};
+
+template<class T>
+struct B : A<T*> {
+  using A<T*>::f;
+  template<class U> void f(U) requires C<T>; // #2
+};
+
+int main() {
+  B<int> b;
+  b.f(42); // { dg-error "ambiguous" } #1 and #2 don't correspond
+}