diff --git a/fraunhofer.py b/fraunhofer.py
index 994da66..2fe9723 100644
--- a/fraunhofer.py
+++ b/fraunhofer.py
@@ -308,10 +308,10 @@ def propagator2d_fraunhoffer(p_x,p_y,image,wavelength=1e-10):
 def line_image(image,horizontal_or_vertical='H'):
     if horizontal_or_vertical == "H":
         npixels = image.shape[0]
-        tmp = image[:,image.shape[1]/2]
+        tmp = image[:,image.shape[1] // 2]
     else:
         npixels = image.shape[1]
-        tmp = image[image.shape[0]/2,:]
+        tmp = image[image.shape[0] // 2, :]
     return tmp
 
 def line_fwhm(line):
@@ -519,4 +519,4 @@ def main():
           title="Vertical profile of diffracted intensity (%s)"%method,xtitle='theta [urad]',ytitle='Diffracted intensity [a.u.]')
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()