diff --git a/xorriso/xorriso_private.h b/xorriso/xorriso_private.h
index 2ea60032..9e9d651d 100644
--- a/xorriso/xorriso_private.h
+++ b/xorriso/xorriso_private.h
@@ -34,6 +34,9 @@
 #endif
 #endif
 
+/* for pthread_mutex_t on OpenBSD */
+#include <pthread.h>
+
 
 /** The source code release timestamp */
 #include "xorriso_timestamp.h"
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index 001e9610..16933f30 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2016.07.20.083654"
+#define Xorriso_timestamP "2016.07.21.103607"