diff --git a/compiler-rt/lib/tsan/rtl/tsan_flags.cpp b/compiler-rt/lib/tsan/rtl/tsan_flags.cpp
--- a/compiler-rt/lib/tsan/rtl/tsan_flags.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_flags.cpp
@@ -13,6 +13,7 @@
 #include "sanitizer_common/sanitizer_flags.h"
 #include "sanitizer_common/sanitizer_flag_parser.h"
 #include "sanitizer_common/sanitizer_libc.h"
+#include "tsan_interface.h"
 #include "tsan_flags.h"
 #include "tsan_rtl.h"
 #include "tsan_mman.h"
@@ -21,14 +22,10 @@
 namespace __tsan {
 
 // Can be overriden in frontend.
-#ifdef TSAN_EXTERNAL_HOOKS
-extern "C" const char* __tsan_default_options();
-#else
 SANITIZER_WEAK_DEFAULT_IMPL
 const char *__tsan_default_options() {
   return "";
 }
-#endif
 
 void Flags::SetDefaults() {
 #define TSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
diff --git a/compiler-rt/lib/tsan/rtl/tsan_interface.h b/compiler-rt/lib/tsan/rtl/tsan_interface.h
--- a/compiler-rt/lib/tsan/rtl/tsan_interface.h
+++ b/compiler-rt/lib/tsan/rtl/tsan_interface.h
@@ -32,6 +32,8 @@
 // before any instrumented code is executed and before any call to malloc.
 SANITIZER_INTERFACE_ATTRIBUTE void __tsan_init();
 
+SANITIZER_INTERFACE_ATTRIBUTE const char* __tsan_default_options();
+
 SANITIZER_INTERFACE_ATTRIBUTE void __tsan_flush_memory();
 
 SANITIZER_INTERFACE_ATTRIBUTE void __tsan_read1(void *addr);