diff --git a/base/memory/weak_ptr.h b/base/memory/weak_ptr.h
index 9ba5e25cfd0ada..006e1fd33fdf7c 100644
--- a/base/memory/weak_ptr.h
+++ b/base/memory/weak_ptr.h
@@ -161,10 +161,9 @@ class SupportsWeakPtrBase {
   // function that makes calling this easier.
   template<typename Derived>
   static WeakPtr<Derived> StaticAsWeakPtr(Derived* t) {
-    using convertible =
-        std::is_convertible<Derived*, internal::SupportsWeakPtrBase*>;
-    static_assert(convertible::value,
-                  "AsWeakPtr argument must inherit from SupportsWeakPtr");
+    static_assert(
+        std::is_base_of<internal::SupportsWeakPtrBase, Derived>::value,
+        "AsWeakPtr argument must inherit from SupportsWeakPtr");
     return AsWeakPtrImpl<Derived>(t, *t);
   }
 
diff --git a/base/memory/weak_ptr_unittest.nc b/base/memory/weak_ptr_unittest.nc
index bad1c97ef9bc4e..32deca9f17bbc6 100644
--- a/base/memory/weak_ptr_unittest.nc
+++ b/base/memory/weak_ptr_unittest.nc
@@ -129,7 +129,7 @@ void WontCompile() {
   WeakPtr<Unrelated> ptr = AsWeakPtr(&f);
 }
 
-#elif defined(NCTEST_AMBIGUOUS_ANCESTORS)  // [r"fatal error: ambiguous conversion from derived class 'base::MultiplyDerivedProducer' to base class 'base::internal::SupportsWeakPtrBase':"]
+#elif defined(NCTEST_AMBIGUOUS_ANCESTORS)  // [r"fatal error: member 'AsWeakPtr' found in multiple base classes of different types"]
 
 void WontCompile() {
   MultiplyDerivedProducer f;