diff --git a/src/include/timestamp.h b/src/include/timestamp.h
index 54d69ce..be33b0a 100644
--- a/src/include/timestamp.h
+++ b/src/include/timestamp.h
@@ -29,7 +29,8 @@
 
 struct timestamp_table {
 	uint64_t	base_time;
-	uint32_t	max_entries;
+	uint16_t	max_entries;
+	uint16_t	tick_freq_mhz;
 	uint32_t	num_entries;
 	struct timestamp_entry entries[0]; /* Variable number of entries */
 } __attribute__((packed));
@@ -114,5 +115,7 @@
 /* Implemented by the architecture code */
 uint64_t timestamp_get(void);
 uint64_t get_initial_timestamp(void);
+/* Returns timestamp tick frequency in MHz. */
+int timestamp_tick_freq_mhz(void);
 
 #endif