diff --git a/esbo_etc/classes/psf/IPSF.py b/esbo_etc/classes/psf/IPSF.py
index 2d33097..1d87896 100644
--- a/esbo_etc/classes/psf/IPSF.py
+++ b/esbo_etc/classes/psf/IPSF.py
@@ -54,7 +54,7 @@ class IPSF(ABC):
         pass
 
     @staticmethod
-    def rebin(arr: np.ndarray, factor: float):
+    def _rebin(arr: np.ndarray, factor: float):
         """
         Rebin a 2D-array by summing or repeating the elements.