diff --git a/dap/algos/streakfind.py b/dap/algos/streakfind.py
index 6e7ecf6..cd892f0 100644
--- a/dap/algos/streakfind.py
+++ b/dap/algos/streakfind.py
@@ -170,8 +170,8 @@ def _calc_streakfinder_analysis(results, snr, mask):
         region = snr
         region_mask = mask
     else:
-        region = snr[crop_roi[0]: crop_roi[1], crop_roi[2]: crop_roi[3]]
-        region_mask = mask[crop_roi[0]: crop_roi[1], crop_roi[2]: crop_roi[3]]
+        region = snr[crop_roi[2]: crop_roi[3], crop_roi[0]: crop_roi[1]]
+        region_mask = mask[crop_roi[2]: crop_roi[3], crop_roi[0]: crop_roi[1]]
     peaks = detect_peaks(region, region_mask, peaks_structure.rank, peak_vmin,
                          num_threads=num_threads)
     peaks = filter_peaks(peaks, region, region_mask, peaks_structure, peak_vmin, npts,