diff --git a/deepfinder/utils/smap.py b/deepfinder/utils/smap.py
index 024f17842fd485577c2c771334fe3df3f3f29228..5643bd70b3b7750e7b6739eb0c45168c2722635c 100644
--- a/deepfinder/utils/smap.py
+++ b/deepfinder/utils/smap.py
@@ -23,9 +23,9 @@ def bin(scoremaps):
     """
     dim = scoremaps.shape
     Ncl = dim[3]
-    dimB0 = np.int(np.round(dim[0]/2))
-    dimB1 = np.int(np.round(dim[1]/2))
-    dimB2 = np.int(np.round(dim[2]/2))
+    dimB0 = np.int(np.ceil(dim[0] / 2))
+    dimB1 = np.int(np.ceil(dim[1] / 2))
+    dimB2 = np.int(np.ceil(dim[2] / 2))
     dimB = (dimB0, dimB1, dimB2, Ncl)
     scoremapsB = np.zeros(dimB)
     for cl in range(0,Ncl):