diff --git a/src/nm-core-utils.h b/src/nm-core-utils.h
index 8e6392349..2fb5273d7 100644
--- a/src/nm-core-utils.h
+++ b/src/nm-core-utils.h
@@ -317,6 +317,9 @@ int nm_utils_cmp_connection_by_autoconnect_priority (NMConnection **a, NMConnect
 void nm_utils_log_connection_diff (NMConnection *connection, NMConnection *diff_base, guint32 level, guint64 domain, const char *name, const char *prefix);
 
 #define NM_UTILS_NS_PER_SECOND  ((gint64) 1000000000)
+#define NM_UTILS_NS_PER_MSEC    ((gint64) 1000000)
+#define NM_UTILS_NS_TO_MSEC_CEIL(nsec)      (((nsec) + (NM_UTILS_NS_PER_MSEC - 1)) / NM_UTILS_NS_PER_MSEC)
+
 gint64 nm_utils_get_monotonic_timestamp_ns (void);
 gint64 nm_utils_get_monotonic_timestamp_us (void);
 gint64 nm_utils_get_monotonic_timestamp_ms (void);