diff --git a/qutebrowser/models/basecompletion.py b/qutebrowser/models/basecompletion.py
index 9430efe10..c020d4d40 100644
--- a/qutebrowser/models/basecompletion.py
+++ b/qutebrowser/models/basecompletion.py
@@ -59,6 +59,8 @@ class BaseCompletionModel(QStandardItemModel):
         marks = []
         if not needle:
             return marks
+        needle = needle.casefold()
+        haystack = haystack.casefold()
         while True:
             pos1 = haystack.find(needle, pos2)
             if pos1 == -1:
diff --git a/qutebrowser/models/completionfilter.py b/qutebrowser/models/completionfilter.py
index 1a5bbd36a..161e54af0 100644
--- a/qutebrowser/models/completionfilter.py
+++ b/qutebrowser/models/completionfilter.py
@@ -141,7 +141,7 @@ class CompletionFilterModel(QSortFilterProxyModel):
         # TODO more sophisticated filtering
         if not self._pattern:
             return True
-        return self._pattern in data
+        return self._pattern.casefold() in data.casefold()
 
     def lessThan(self, lindex, rindex):
         """Custom sorting implementation.