diff --git a/lib/Basic/Module.cpp b/lib/Basic/Module.cpp
index 1a48a6c..9eb135f 100644
--- a/lib/Basic/Module.cpp
+++ b/lib/Basic/Module.cpp
@@ -184,18 +184,12 @@ void Module::addRequirement(StringRef Feature, bool RequiredState,
 }
 
 void Module::markUnavailable(bool MissingRequirement) {
-  if (!IsAvailable)
-    return;
-
   SmallVector<Module *, 2> Stack;
   Stack.push_back(this);
   while (!Stack.empty()) {
     Module *Current = Stack.back();
     Stack.pop_back();
 
-    if (!Current->IsAvailable)
-      continue;
-
     Current->IsAvailable = false;
     Current->IsMissingRequirement |= MissingRequirement;
     for (submodule_iterator Sub = Current->submodule_begin(),