diff --git a/src/v2x_app.cpp b/src/v2x_app.cpp
index c6b18a5..e6be106 100644
--- a/src/v2x_app.cpp
+++ b/src/v2x_app.cpp
@@ -56,8 +56,9 @@ namespace v2x
       int gdt_timestamp_sec = msg->transforms[0].header.stamp.sec; // seconds
       int gdt_timestamp_nsec = msg->transforms[0].header.stamp.nanosec; // nanoseconds
       long long gdt_timestamp = gdt_timestamp_sec * 1e9 + gdt_timestamp_nsec; // nanoseconds
-      int gdt_timestamp_msec = gdt_timestamp / 1e6;
+      long long gdt_timestamp_msec = gdt_timestamp / 1000000;
       int gdt = gdt_timestamp_msec % 65536; // milliseconds
+      RCLCPP_INFO(node_->get_logger(), "gdt %d, gdt_timestamp %ld, gdt_timestamp_msec %ld", gdt, gdt_timestamp, gdt_timestamp_msec);
 
       double rot_x = msg->transforms[0].transform.rotation.x;
       double rot_y = msg->transforms[0].transform.rotation.y;