diff --git a/proto/protocol.xml b/proto/protocol.xml
index 01b85b6..362657e 100644
--- a/proto/protocol.xml
+++ b/proto/protocol.xml
@@ -708,8 +708,7 @@
         of an ei_connection_setup.context_type other than sender.
       </description>
       <arg name="last_serial" type="uint32" summary="the last serial sent by the EIS implementation"/>
-      <arg name="timestamp" type="uint32" summary="timestamp in milliseconds"/>
-      <arg name="micros" type="uint32" summary="microseconds in addition to the millis"/>
+      <arg name="timestamp" type="uint64" summary="timestamp in microseconds"/>
     </request>
 
     <!-- ei_device events version 1 -->
@@ -980,8 +979,7 @@
         of an ei_connection_setup.context_type other than receiver.
       </description>
       <arg name="serial" type="uint32" summary="this event's serial number"/>
-      <arg name="timestamp" type="uint32" summary="timestamp in milliseconds"/>
-      <arg name="micros" type="uint32" summary="microseconds in addition to the millis"/>
+      <arg name="timestamp" type="uint64" summary="timestamp in microseconds"/>
     </event>
   </interface>
 
diff --git a/src/libei-device.c b/src/libei-device.c
index 35f8e1f..7ab3f5a 100644
--- a/src/libei-device.c
+++ b/src/libei-device.c
@@ -360,14 +360,14 @@ maybe_error_on_device_state(struct ei_device *device, const char *event_type)
 }
 
 static struct brei_result *
-handle_msg_frame(struct ei_device *device, uint32_t serial, uint32_t time, uint32_t micros)
+handle_msg_frame(struct ei_device *device, uint32_t serial, uint64_t time)
 {
 	DISCONNECT_IF_SENDER_CONTEXT(device);
 
 	ei_update_serial(ei_device_get_context(device), serial);
 
 	if (device->state == EI_DEVICE_STATE_EMULATING) {
-		ei_queue_frame_event(device, ms2us(time) + micros);
+		ei_queue_frame_event(device, time);
 		return NULL;
 	}
 
@@ -1620,7 +1620,7 @@ ei_device_frame(struct ei_device *device, uint64_t time)
 
 	device->send_frame_event = false;
 
-	int rc = ei_device_request_frame(device, ei_get_serial(ei), us2ms(time), time % 1000);
+	int rc = ei_device_request_frame(device, ei_get_serial(ei), time);
 	if (rc)
 		ei_disconnect(ei_device_get_context(device));
 	return;
diff --git a/src/libeis-device.c b/src/libeis-device.c
index 773e042..e9b27ae 100644
--- a/src/libeis-device.c
+++ b/src/libeis-device.c
@@ -320,14 +320,14 @@ maybe_error_on_device_state(struct eis_device *device, const char *event_type)
 }
 
 static struct brei_result *
-client_msg_frame(struct eis_device *device, uint32_t serial, uint32_t time, uint32_t micros)
+client_msg_frame(struct eis_device *device, uint32_t serial, uint64_t time)
 {
 	eis_client_update_client_serial(eis_device_get_client(device), serial);
 
 	DISCONNECT_IF_RECEIVER_CONTEXT(device);
 
 	if (device->state == EIS_DEVICE_STATE_EMULATING) {
-		eis_queue_frame_event(device, ms2us(time) + micros);
+		eis_queue_frame_event(device, time);
 		return NULL;
 	}
 
@@ -1211,7 +1211,7 @@ eis_device_frame(struct eis_device *device, uint64_t time)
 	device->send_frame_event = false;
 
 	eis_device_event_frame(device, eis_client_get_next_serial(client),
-			       us2ms(time), time % 1000);
+			       time);
 }
 
 void