diff --git a/src/H5TSprivate.h b/src/H5TSprivate.h
index f22ed52dfb..887f001175 100644
--- a/src/H5TSprivate.h
+++ b/src/H5TSprivate.h
@@ -26,6 +26,7 @@
 #ifndef H5TSprivate_H_
 #define H5TSprivate_H_
 
+#ifdef H5_HAVE_THREADSAFE
 /* Public headers needed by this file */
 #ifdef LATER
 #include "H5TSpublic.h"		/*Public API prototypes */
@@ -128,5 +129,11 @@ H5_DLL H5TS_thread_t H5TS_create_thread(void *(*func)(void *), H5TS_attr_t * att
 }
 #endif	/* c_plusplus || __cplusplus */
 
+#else /* H5_HAVE_THREADSAFE */
+
+#define H5TS_thread_id() ((uint64_t)0)
+
+#endif /* H5_HAVE_THREADSAFE */
+
 #endif	/* H5TSprivate_H_ */