diff --git a/dap/algos/mask.py b/dap/algos/mask.py
index 7c73ef1..febd40f 100644
--- a/dap/algos/mask.py
+++ b/dap/algos/mask.py
@@ -5,7 +5,7 @@ def calc_mask_pixels(data, pixel_mask_pf):
     if pixel_mask_pf is None:
         return
 
-    data[pixel_mask_pf != 1] = np.nan #TODO: boolean mask
+    data[pixel_mask_pf == 0] = np.nan #TODO: boolean mask
 
 
 
diff --git a/dap/algos/radprof.py b/dap/algos/radprof.py
index b1b3fcf..5a958e0 100644
--- a/dap/algos/radprof.py
+++ b/dap/algos/radprof.py
@@ -3,7 +3,7 @@ import numpy as np
 
 def calc_radial_integration(results, data, keep_pixels, pixel_mask_pf, center_radial_integration, r_radial_integration):
     if keep_pixels is None and pixel_mask_pf is not None:
-        keep_pixels = (pixel_mask_pf != 0) #TODO: boolean mask
+        keep_pixels = (pixel_mask_pf == 1) #TODO: boolean mask
 
     if center_radial_integration is None:
         center_radial_integration = [