diff --git a/jdaviz/configs/imviz/helper.py b/jdaviz/configs/imviz/helper.py
index 5aa5482523..938e80a64a 100644
--- a/jdaviz/configs/imviz/helper.py
+++ b/jdaviz/configs/imviz/helper.py
@@ -252,8 +252,7 @@ def zoom_level(self, val):
             new_x_min = 0
             new_x_max = nx
         else:
-            width = viewer.state.x_max - viewer.state.x_min
-            cur_xcen = viewer.state.x_min + (width * 0.5)
+            cur_xcen = (viewer.state.x_min + viewer.state.x_max) * 0.5
             new_dx = nx * 0.5 / val
             new_x_min = cur_xcen - new_dx
             new_x_max = cur_xcen + new_dx