diff --git a/TSRM/TSRM.c b/TSRM/TSRM.c
index 32c28993f84..6b0bf445e9c 100644
--- a/TSRM/TSRM.c
+++ b/TSRM/TSRM.c
@@ -63,8 +63,12 @@ static int tsrm_error_level;
 static FILE *tsrm_error_file;
 
 #ifdef USE___THREAD
+#ifdef TSRM_WIN32
+TSRM_TLS void *tsrm_ls_cache = 0;
+#else
 TSRM_API TSRM_TLS void *tsrm_ls_cache = 0;
 #endif
+#endif
 
 #ifdef PASS_TSRMLS
 # define CALL_TSRMG_CTOR(ctor, globale, storage)                 (ctor)((globale), (storage))
diff --git a/TSRM/TSRM.h b/TSRM/TSRM.h
index f77dcbf0358..840c303d6c5 100644
--- a/TSRM/TSRM.h
+++ b/TSRM/TSRM.h
@@ -109,7 +109,11 @@ extern "C" {
 # define TSRM_TLS __thread
 # endif
 
+#ifdef TSRM_WIN32
+extern TSRM_TLS void *tsrm_ls_cache;
+#else
 TSRM_API extern TSRM_TLS void *tsrm_ls_cache;
+#endif
 
 #define TSRMG(id, type, element) \
  ((type)((tsrm_uintptr_t)tsrm_ls_cache + id##_offset))->element