diff --git a/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp b/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
--- a/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
+++ b/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
@@ -1563,15 +1563,7 @@
   ast.getTypeDeclType(class_template_specialization_decl, nullptr);
   class_template_specialization_decl->setDeclName(
       class_template_decl->getDeclName());
-  // FIXME: Turning this on breaks the libcxx data formatter tests.
-  // SetOwningModule marks the Decl as external, which prevents a
-  // LookupPtr from being built. Template instantiations can also not
-  // be found by ExternalASTSource::FindExternalVisibleDeclsByName(),
-  // nor can we lazily build a LookupPtr later, because template
-  // specializations are supposed to be hidden so
-  // makeDeclVisibleInContextWithFlags() is a noop, as well.
-  //
-  // SetOwningModule(class_template_specialization_decl, owning_module);
+  SetOwningModule(class_template_specialization_decl, owning_module);
   decl_ctx->addDecl(class_template_specialization_decl);
 
   class_template_specialization_decl->setSpecializationKind(
diff --git a/lldb/test/Shell/SymbolFile/DWARF/module-ownership.mm b/lldb/test/Shell/SymbolFile/DWARF/module-ownership.mm
--- a/lldb/test/Shell/SymbolFile/DWARF/module-ownership.mm
+++ b/lldb/test/Shell/SymbolFile/DWARF/module-ownership.mm
@@ -52,10 +52,10 @@
 
 // Template specializations are not yet supported, so they lack the ownership info:
 Template<int> t2;
-// CHECK-DAG: ClassTemplateSpecializationDecl {{.*}} struct Template
+// CHECK-DAG: ClassTemplateSpecializationDecl {{.*}} imported in A struct Template
 
 Namespace::InNamespace<int> t3;
-// CHECK-DAG: ClassTemplateSpecializationDecl {{.*}} struct InNamespace
+// CHECK-DAG: ClassTemplateSpecializationDecl {{.*}} imported in A struct InNamespace
 
 Namespace::AlsoInNamespace<int> t4;
-// CHECK-DAG: ClassTemplateSpecializationDecl {{.*}} struct AlsoInNamespace
+// CHECK-DAG: ClassTemplateSpecializationDecl {{.*}} imported in A.B struct AlsoInNamespace