diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 624839cc944e..627165fa2c79 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -5932,7 +5932,6 @@ TreeTransform<Derived>::TransformObjCObjectType(TypeLocBuilder &TLB,
   }
 
   ObjCObjectTypeLoc NewT = TLB.push<ObjCObjectTypeLoc>(Result);
-  assert(TL.hasBaseTypeAsWritten() && "Can't be dependent");
   NewT.setHasBaseTypeAsWritten(true);
   NewT.setTypeArgsLAngleLoc(TL.getTypeArgsLAngleLoc());
   for (unsigned i = 0, n = TL.getNumTypeArgs(); i != n; ++i)
diff --git a/clang/test/SemaObjCXX/base-type-as-written.mm b/clang/test/SemaObjCXX/base-type-as-written.mm
new file mode 100644
index 000000000000..05962e3f288c
--- /dev/null
+++ b/clang/test/SemaObjCXX/base-type-as-written.mm
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// Make sure we don't crash in TreeTransform<Derived>::TransformObjCObjectType.
+
+@protocol P1
+@end
+
+template <class T1><P1> foo1(T1) { // expected-warning {{protocol has no object type specified; defaults to qualified 'id'}}
+  foo1(0);
+}