diff --git a/lib/Transforms/IPO/Internalize.cpp b/lib/Transforms/IPO/Internalize.cpp
index af5b9bd99e4..cd29e7a7a7d 100644
--- a/lib/Transforms/IPO/Internalize.cpp
+++ b/lib/Transforms/IPO/Internalize.cpp
@@ -122,6 +122,9 @@ bool InternalizePass::runOnModule(Module &M) {
 
   bool Changed = false;
 
+  // Never internalize functions which code-gen might insert.
+  ExternalNames.insert("__stack_chk_fail");
+
   // Mark all functions not in the api as internal.
   // FIXME: maybe use private linkage?
   for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
@@ -150,6 +153,9 @@ bool InternalizePass::runOnModule(Module &M) {
   ExternalNames.insert("llvm.global_dtors");
   ExternalNames.insert("llvm.global.annotations");
 
+  // Never internalize symbols code-gen inserts.
+  ExternalNames.insert("__stack_chk_guard");
+
   // Mark all global variables with initializers that are not in the api as
   // internal as well.
   // FIXME: maybe use private linkage?