diff --git a/hgext3rd/drop.py b/hgext3rd/drop.py
--- a/hgext3rd/drop.py
+++ b/hgext3rd/drop.py
@@ -55,7 +55,7 @@
     try:
         return extensions.find(name)
     except KeyError:
-        ui.warn(_('extension %s not found\n' % name))
+        ui.warn(_('extension %s not found\n') % name)
         return None
 
 
diff --git a/tests/test-drop.t b/tests/test-drop.t
--- a/tests/test-drop.t
+++ b/tests/test-drop.t
@@ -11,7 +11,7 @@
   $ cd a
   $ cat >> .hg/hgrc <<EOF
   > [extensions]
-  > drop=
+  > drop = $TESTDIR/../hgext3rd/drop.py
   > EOF
 
   $ hg drop 1
@@ -23,7 +23,7 @@
   $ cat >> .hg/hgrc <<EOF
   > [extensions]
   > rebase=
-  > drop=
+  > drop = $TESTDIR/../hgext3rd/drop.py
   > [experimental]
   > evolution=all
   > EOF
@@ -50,7 +50,7 @@
   $ cat >> .hg/hgrc <<EOF
   > [extensions]
   > rebase=
-  > drop=
+  > drop = $TESTDIR/../hgext3rd/drop.py
   > [experimental]
   > evolution=all
   > EOF
@@ -87,7 +87,7 @@
   $ cat >> .hg/hgrc <<EOF
   > [extensions]
   > rebase=
-  > drop=
+  > drop = $TESTDIR/../hgext3rd/drop.py
   > [experimental]
   > evolution=all
   > EOF
@@ -179,7 +179,7 @@
   $ cat >> .hg/hgrc <<EOF
   > [extensions]
   > rebase=
-  > drop=
+  > drop = $TESTDIR/../hgext3rd/drop.py
   > [experimental]
   > evolution=all
   > EOF