diff --git a/vz_ros_wrappers/scripts/orvs_ros_interface.py b/vz_ros_wrappers/scripts/orvs_ros_interface.py
index 52b3f55..9e8d9c4 100755
--- a/vz_ros_wrappers/scripts/orvs_ros_interface.py
+++ b/vz_ros_wrappers/scripts/orvs_ros_interface.py
@@ -49,9 +49,9 @@ class FLIR_LEPTON:
         if self.index < 300:
             print(self.index)
             self.frame_arr[self.index] = cv_image
-            self.index += 1
             deltat = t.to_sec() - self.t_zero
             self.time_arr[self.index] = deltat
+            self.index += 1
         else: # when list is full
             self.index = 0 # reset index
             vid_arr = np.asarray(self.frame_arr) # make into np array