diff --git a/src/calibre/gui2/search_box.py b/src/calibre/gui2/search_box.py
index 6cfa3d0fec..85ddf533c4 100644
--- a/src/calibre/gui2/search_box.py
+++ b/src/calibre/gui2/search_box.py
@@ -197,7 +197,7 @@ class SearchBox2(QComboBox):  # {{{
         self.search.emit(text)
 
         if store_in_history:
-            idx = self.findText(text, Qt.MatchFixedString)
+            idx = self.findText(text, Qt.MatchFixedString|Qt.MatchCaseSensitive)
             self.block_signals(True)
             if idx < 0:
                 self.insertItem(0, text)