diff --git a/googletest/include/gtest/internal/gtest-port.h b/googletest/include/gtest/internal/gtest-port.h
index 331483e7..0c360072 100644
--- a/googletest/include/gtest/internal/gtest-port.h
+++ b/googletest/include/gtest/internal/gtest-port.h
@@ -2066,7 +2066,7 @@ extern "C" inline void DeleteThreadLocalValue(void* value_holder) {
 
 // Implements thread-local storage on pthreads-based systems.
 template <typename T>
-class ThreadLocal {
+class GTEST_API_ ThreadLocal {
  public:
   ThreadLocal()
       : key_(CreateKey()), default_factory_(new DefaultValueHolderFactory()) {}
@@ -2198,7 +2198,7 @@ class GTestMutexLock {
 typedef GTestMutexLock MutexLock;
 
 template <typename T>
-class ThreadLocal {
+class GTEST_API_ ThreadLocal {
  public:
   ThreadLocal() : value_() {}
   explicit ThreadLocal(const T& value) : value_(value) {}