diff --git a/python_package/src/onlinemid/roi/roi.py b/python_package/src/onlinemid/roi/roi.py
index 85108f0abe21f6a9d273b039210a654583abde72..4b17d1591c0ba1dee273ddb92e0771fc3f4a3368 100644
--- a/python_package/src/onlinemid/roi/roi.py
+++ b/python_package/src/onlinemid/roi/roi.py
@@ -40,10 +40,10 @@ def make_onlineroi_from_roi_array(roi_array):
 
             val = roi_ravel[index]
 
-            if val == True:
+            if val == 1:
                 length = 1
                 if index+length < roi_array.size:
-                    while roi_ravel[index+length] == True:
+                    while roi_ravel[index+length] == 1:
                         length +=1         
 
                 compressed_data.add(np.array([index, length], dtype=np.uint32))