diff --git a/fdroidserver/lint.py b/fdroidserver/lint.py
index 2dc66d93..6a662010 100644
--- a/fdroidserver/lint.py
+++ b/fdroidserver/lint.py
@@ -313,7 +313,7 @@ all_categories = set([
 def check_categories(app):
     for categ in app.Categories:
         if categ not in all_categories:
-            yield _("Category '%s' is not valid" % categ)
+            yield _("Categories '%s' is not valid" % categ)
 
 
 def check_duplicates(app):
diff --git a/locale/fdroidserver.pot b/locale/fdroidserver.pot
index 64ff855c..6794643d 100644
--- a/locale/fdroidserver.pot
+++ b/locale/fdroidserver.pot
@@ -342,7 +342,7 @@ msgstr ""
 
 #: ../fdroidserver/lint.py
 #, python-format
-msgid "Category '%s' is not valid"
+msgid "Categories '%s' is not valid"
 msgstr ""
 
 #: ../fdroid