diff --git a/utils/show3d_balls.py b/utils/show3d_balls.py
index 8122bb17..6f4ace4d 100644
--- a/utils/show3d_balls.py
+++ b/utils/show3d_balls.py
@@ -20,7 +20,7 @@ def onmouse(*args):
 cv2.moveWindow('show3d',0,0)
 cv2.setMouseCallback('show3d',onmouse)
 
-dll=np.ctypeslib.load_library(os.path.join(BASE_DIR, 'render_balls_so'),'.')
+dll=np.ctypeslib.load_library(os.path.join(BASE_DIR, 'render_balls_so.so'),'.')
 
 def showpoints(xyz,c_gt=None, c_pred = None ,waittime=0,showrot=False,magnifyBlue=0,freezerot=False,background=(0,0,0),normalizecolor=True,ballradius=10):
     global showsz,mousex,mousey,zoom,changed