diff --git a/octopipes/process.py b/octopipes/process.py
index caf8476..a554ad7 100644
--- a/octopipes/process.py
+++ b/octopipes/process.py
@@ -1,5 +1,5 @@
 """General useful set of processes"""
 
 def circles_to_bboxes(circles) -> list:
-    return [(int(x - r), int(y + r), int(x + r), int(y - r))
-                for x, y, r in circles]
+    return [(int(x) - int(r), int(y) - int(r), int(x) + int(r), int(y) + int(r)) 
+            for x, y, r in circles]