diff --git a/include/gmrf/gmrf.h b/include/gmrf/gmrf.h
index c0a36ea..742848c 100644
--- a/include/gmrf/gmrf.h
+++ b/include/gmrf/gmrf.h
@@ -45,10 +45,12 @@ typedef struct gmrf_addr {
 	uint8_t d[GMRF_ADDR_LEN];
 } gmrf_addr_t;
 
+static const gmrf_addr_t gmrf_addr_unspec = {};
+
+
 typedef uint64_t gmrf_time_t;
 
-
-static const gmrf_addr_t gmrf_addr_unspec = {};
+static const gmrf_time_t gmrf_time_unspec = UINT64_MAX;
 
 
 static inline bool gmrf_addr_equal(const gmrf_addr_t *addr1, const gmrf_addr_t *addr2) {