diff --git a/src/main/protobuf/opensync_stats.proto b/src/main/protobuf/opensync_stats.proto
index 53c68b5..f0d8768 100644
--- a/src/main/protobuf/opensync_stats.proto
+++ b/src/main/protobuf/opensync_stats.proto
@@ -697,7 +697,7 @@ message EventReport {
         optional bool                   using11k                            = 9;
         optional bool                   using11r                            = 10;
         optional bool                   using11v                            = 11;
-        optional uint32                 timestamp_ms                        = 12;
+        required uint64                 timestamp_ms                        = 12;
     }
 
     /* Client Authentication Event */
@@ -707,7 +707,7 @@ message EventReport {
         required string                 ssid                                = 3;
         required RadioBandType          band                                = 4;
         optional uint32                 auth_status                         = 5;
-        optional uint32                 timestamp_ms                        = 6;
+        required uint64                 timestamp_ms                        = 6;
     }
 
     /* Client Disconnect Event */
@@ -723,7 +723,7 @@ message EventReport {
         optional int32                  rssi                                = 9;
         required string                 ssid                                = 10;
         required RadioBandType          band                                = 11;
-        optional uint32                 timestamp_ms                        = 12;
+        required uint64                 timestamp_ms                        = 12;
     }
 
     /* Client Connnect Event */
@@ -748,7 +748,7 @@ message EventReport {
         optional bool                   using11v                            = 18;
         optional int64                  ev_time_bootup_in_us_ip             = 19;
         optional int32                  assoc_rssi                          = 20;
-        optional uint32                 timestamp_ms                        = 21;
+        required uint64                 timestamp_ms                        = 21;
     }
 
     /* Client Failure Event */
@@ -758,7 +758,7 @@ message EventReport {
         required string                 ssid                                = 3;
         optional int32                  reason_code                         = 4;
         optional string                 reason_str                          = 5;
-        optional uint32                 timestamp_ms                        = 6;
+        required uint64                 timestamp_ms                        = 6;
     }
 
     /* Client First Data Event */
@@ -767,7 +767,7 @@ message EventReport {
         required uint64                 session_id                          = 2;
         optional uint64                 fdata_tx_up_ts_in_us                = 3;
         optional uint64                 fdata_rx_up_ts_in_us                = 4;
-        optional uint32                 timestamp_ms                        = 5;
+        required uint64                 timestamp_ms                        = 5;
     }
 
     /* Client Id Event */
@@ -775,7 +775,7 @@ message EventReport {
         required string                 clt_mac                             = 1;
         required uint64                 session_id                          = 2;
         optional string                 clt_id                              = 3;
-        optional uint32                 timestamp_ms                        = 4;
+        required uint64                 timestamp_ms                        = 4;
     }
 
     /* Client IP Event */
@@ -783,7 +783,7 @@ message EventReport {
         required string                 sta_mac                             = 1;
         required uint64                 session_id                          = 2;
         optional bytes                  ip_addr                             = 3;
-        optional uint32                 timestamp_ms                        = 4;
+        required uint64                 timestamp_ms                        = 4;
     }
 
     /* Client Timeout Event */
@@ -793,7 +793,7 @@ message EventReport {
         optional CTReasonType           r_code                              = 3;
         optional uint64                 last_sent_up_ts_in_us               = 4;
         optional uint64                 last_rcv_up_ts_in_us                = 5;
-        optional uint32                 timestamp_ms                        = 6;
+        required uint64                 timestamp_ms                        = 6;
     }
 
       /* Channel Switch Event */
@@ -827,7 +827,7 @@ message EventReport {
         optional bytes                  client_ip                           = 4;
         optional bytes                  relay_ip                            = 5;
         optional string                 device_mac_address                  = 6;
-        optional uint32                 timestamp_ms                        = 7;
+        required uint64                 timestamp_ms                        = 7;
     }
 
     /* DHCP Ack Event */