diff --git a/astropy/units/quantity_helper/helpers.py b/astropy/units/quantity_helper/helpers.py
index 0758009cc094..965e7a309fc1 100644
--- a/astropy/units/quantity_helper/helpers.py
+++ b/astropy/units/quantity_helper/helpers.py
@@ -432,3 +432,5 @@ def helper_clip(f, unit1, unit2, unit3):
 # Check for clip ufunc; note that np.clip is a wrapper function, not the ufunc.
 if isinstance(getattr(np.core.umath, 'clip', None), np.ufunc):
     UFUNC_HELPERS[np.core.umath.clip] = helper_clip
+
+del ufunc