1 files changed, 1 insertions, 1 deletions
diff --git a/src/H5E.c b/src/H5E.c
index 47c86df..eafa2a4 100644
--- a/src/H5E.c
+++ b/src/H5E.c
@@ -2193,7 +2193,7 @@ H5E_walk_cb(unsigned n, const H5E_error_t *err_desc, void *client_data)
 	        fprintf (stream, "thread 0");
         }
 #elif defined(H5_HAVE_THREADSAFE)
-        fprintf (stream, "thread %d", (int)pthread_self());
+        fprintf (stream, "thread %lu", (unsigned long)pthread_self());
 #else
         fprintf (stream, "thread 0");
 #endif