diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -456,9 +456,7 @@
 
 
 def resolvehexnodeidprefix(repo, prefix):
-    if prefix.startswith(b'x') and repo.ui.configbool(
-        b'experimental', b'revisions.prefixhexnode'
-    ):
+    if prefix.startswith(b'x'):
         prefix = prefix[1:]
     try:
         # Uses unfiltered repo because it's faster when prefix is ambiguous/
diff --git a/tests/test-revset.t b/tests/test-revset.t
--- a/tests/test-revset.t
+++ b/tests/test-revset.t
@@ -1864,12 +1864,12 @@
   $ log 'id(2)'
   $ log 'id(8)'
   3
-  $ hg --config experimental.revisions.prefixhexnode=yes log --template '{rev}\n' -r 'id(x8)'
+  $ hg log --template '{rev}\n' -r 'id(x8)'
   3
-  $ hg --config experimental.revisions.prefixhexnode=yes log --template '{rev}\n' -r 'x8'
+  $ hg log --template '{rev}\n' -r 'x8'
   3
-  $ hg --config experimental.revisions.prefixhexnode=yes log --template '{rev}\n' -r 'id(x)'
-  $ hg --config experimental.revisions.prefixhexnode=yes log --template '{rev}\n' -r 'x'
+  $ hg log --template '{rev}\n' -r 'id(x)'
+  $ hg log --template '{rev}\n' -r 'x'
   abort: 00changelog.i@: ambiguous identifier!
   [255]
   $ log 'id(23268)'