diff --git a/include/llvm-c/lto.h b/include/llvm-c/lto.h
index c6acdaddca5..2f3aac7ed87 100644
--- a/include/llvm-c/lto.h
+++ b/include/llvm-c/lto.h
@@ -40,7 +40,7 @@ typedef bool lto_bool_t;
  * @{
  */
 
-#define LTO_API_VERSION 13
+#define LTO_API_VERSION 14
 
 /**
  * \since prior to LTO_API_VERSION=3
@@ -548,6 +548,16 @@ lto_codegen_debug_options(lto_code_gen_t cg, const char *);
 extern void
 lto_initialize_disassembler(void);
 
+/**
+ * Sets if we should run internalize pass during optimization and code
+ * generation.
+ *
+ * \since prior to LTO_API_VERSION=14
+ */
+extern void
+lto_codegen_set_should_internalize(lto_code_gen_t cg,
+                                   lto_bool_t ShouldInternalize);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/llvm/LTO/LTOCodeGenerator.h b/include/llvm/LTO/LTOCodeGenerator.h
index a4aace41a72..ff3b71a1a0e 100644
--- a/include/llvm/LTO/LTOCodeGenerator.h
+++ b/include/llvm/LTO/LTOCodeGenerator.h
@@ -79,6 +79,8 @@ struct LTOCodeGenerator {
   void setAttr(const char *mAttr) { MAttr = mAttr; }
   void setOptLevel(unsigned optLevel) { OptLevel = optLevel; }
 
+  void setShouldInternalize(bool Value) { ShouldInternalize = Value; }
+
   void addMustPreserveSymbol(const char *sym) { MustPreserveSymbols[sym] = 1; }
 
   // To pass options to the driver and optimization passes. These options are
@@ -174,6 +176,7 @@ private:
   lto_diagnostic_handler_t DiagHandler;
   void *DiagContext;
   LTOModule *OwnedModule;
+  bool ShouldInternalize;
 };
 }
 #endif
diff --git a/lib/LTO/LTOCodeGenerator.cpp b/lib/LTO/LTOCodeGenerator.cpp
index b4a70119cc2..16718d7ce64 100644
--- a/lib/LTO/LTOCodeGenerator.cpp
+++ b/lib/LTO/LTOCodeGenerator.cpp
@@ -82,6 +82,7 @@ void LTOCodeGenerator::initialize() {
   DiagHandler = nullptr;
   DiagContext = nullptr;
   OwnedModule = nullptr;
+  ShouldInternalize = true;
 
   initializeLTOPasses();
 }
@@ -464,7 +465,7 @@ static void accumulateAndSortLibcalls(std::vector<StringRef> &Libcalls,
 }
 
 void LTOCodeGenerator::applyScopeRestrictions() {
-  if (ScopeRestrictionsDone)
+  if (ScopeRestrictionsDone || !ShouldInternalize)
     return;
   Module *mergedModule = IRLinker.getModule();
 
diff --git a/tools/lto/lto.cpp b/tools/lto/lto.cpp
index cc4169fda99..e66a7786a14 100644
--- a/tools/lto/lto.cpp
+++ b/tools/lto/lto.cpp
@@ -333,3 +333,8 @@ void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
 }
 
 unsigned int lto_api_version() { return LTO_API_VERSION; }
+
+void lto_codegen_set_should_internalize(lto_code_gen_t cg,
+                                        bool ShouldInternalize) {
+  unwrap(cg)->setShouldInternalize(ShouldInternalize);
+}
diff --git a/tools/lto/lto.exports b/tools/lto/lto.exports
index 8729050123e..9145a6ff4dd 100644
--- a/tools/lto/lto.exports
+++ b/tools/lto/lto.exports
@@ -41,6 +41,7 @@ lto_codegen_set_cpu
 lto_codegen_compile_to_file
 lto_codegen_optimize
 lto_codegen_compile_optimized
+lto_codegen_set_should_internalize
 LLVMCreateDisasm
 LLVMCreateDisasmCPU
 LLVMDisasmDispose