2 files changed, 5 insertions, 12 deletions
diff --git a/src/H5TS.c b/src/H5TS.c
index 7a801e2..9503e05 100644
--- a/src/H5TS.c
+++ b/src/H5TS.c
@@ -639,13 +639,4 @@ H5TS_create_thread(void *(*func)(void *), H5TS_attr_t *attr, void *udata)
 
 } /* H5TS_create_thread */
 
-#else  /* H5_HAVE_THREADSAFE */
-
-uint64_t
-H5TS_thread_id(void)
-{
-    return 0;
-}
-
 #endif  /* H5_HAVE_THREADSAFE */
-
diff --git a/src/H5private.h b/src/H5private.h
index f0f3687..2f5a727 100644
--- a/src/H5private.h
+++ b/src/H5private.h
@@ -1897,12 +1897,14 @@ H5_DLL double H5_trace(const double *calltime, const char *func, const char *typ
 /* global library version information string */
 extern char  H5_lib_vers_info_g[];
 
+/* Include required thread-safety header, always, for the H5TS_thread_id()
+ * definition.
+ */
+#include "H5TSprivate.h"
+
 /* Lock headers */
 #ifdef H5_HAVE_THREADSAFE
 
-/* Include required thread-safety header */
-#include "H5TSprivate.h"
-
 /* replacement structure for original global variable */
 typedef struct H5_api_struct {
     H5TS_mutex_t init_lock;  /* API entrance mutex */