diff --git a/spec2nii/GE/ge_read_pfile.py b/spec2nii/GE/ge_read_pfile.py
index 9223c3f..71e150e 100644
--- a/spec2nii/GE/ge_read_pfile.py
+++ b/spec2nii/GE/ge_read_pfile.py
@@ -584,8 +584,8 @@ def get_fov(self):
 
             # CSI has already been reordered if needed - so fov  calculated
             # with this CSI will not need reordering, need next power of 2:
-            xdim = int(pow(2, math.ceil(math.log(nvox[0], 2))))
-            ydim = int(pow(2, math.ceil(math.log(nvox[1], 2))))
+            xdim = int(pow(2, math.ceil(math.log2(nvox[0]))))
+            ydim = int(pow(2, math.ceil(math.log2(nvox[1]))))
 
             if (ydim > xdim):
                 fov_spatial_resolution = dfov / ydim