diff --git a/qutebrowser/completion/completiondelegate.py b/qutebrowser/completion/completiondelegate.py
index 6b1309378..e0e56e023 100644
--- a/qutebrowser/completion/completiondelegate.py
+++ b/qutebrowser/completion/completiondelegate.py
@@ -45,7 +45,7 @@ class _Highlighter(QSyntaxHighlighter):
 
     def highlightBlock(self, text):
         """Override highlightBlock for custom highlighting."""
-        for match in re.finditer(self._pattern, text):
+        for match in re.finditer(self._pattern, text, re.IGNORECASE):
             start, end = match.span()
             length = end - start
             self.setFormat(start, length, self._format)
diff --git a/tests/unit/completion/test_completiondelegate.py b/tests/unit/completion/test_completiondelegate.py
index f9f6dc492..2d122927d 100644
--- a/tests/unit/completion/test_completiondelegate.py
+++ b/tests/unit/completion/test_completiondelegate.py
@@ -28,6 +28,7 @@ from qutebrowser.completion import completiondelegate
 @pytest.mark.parametrize('pat,txt,segments', [
     ('foo', 'foo', [(0, 3)]),
     ('foo', 'foobar', [(0, 3)]),
+    ('foo', 'FOObar', [(0, 3)]),  # re.IGNORECASE
     ('foo', 'barfoo', [(3, 3)]),
     ('foo', 'barfoobaz', [(3, 3)]),
     ('foo', 'barfoobazfoo', [(3, 3), (9, 3)]),