diff --git a/dap/algos/roi.py b/dap/algos/roi.py
index c1d8bb6..6f585ee 100644
--- a/dap/algos/roi.py
+++ b/dap/algos/roi.py
@@ -12,7 +12,7 @@ def calc_roi(results, data, roi_x1, roi_x2, roi_y1, roi_y2, pixel_mask_pf, thres
     results["roi_intensities_proj_x"] = []
 
     for iRoi in range(len(roi_x1)):
-        data_roi = np.copy(data[roi_y1[iRoi]:roi_y2[iRoi], roi_x1[iRoi]:roi_x2[iRoi]])
+        data_roi = data[roi_y1[iRoi]:roi_y2[iRoi], roi_x1[iRoi]:roi_x2[iRoi]]
 
         roi_results[iRoi] = np.nansum(data_roi)
         if threshold_value_choice == "NaN":