diff --git a/src/calibre/gui2/comments_editor.py b/src/calibre/gui2/comments_editor.py
index c5058067d5..fa599f37bf 100644
--- a/src/calibre/gui2/comments_editor.py
+++ b/src/calibre/gui2/comments_editor.py
@@ -640,6 +640,9 @@ class Editor(QWidget):  # {{{
         self.highlighter = Highlighter(self.code_edit.document())
         self.layout().setContentsMargins(0, 0, 0, 0)
 
+    def set_minimum_height_for_editor(self, val):
+        self.editor.setMinimumHeight(val)
+
         # toolbar1 {{{
         self.toolbar1.addAction(self.editor.action_undo)
         self.toolbar1.addAction(self.editor.action_redo)
diff --git a/src/calibre/gui2/metadata/diff.py b/src/calibre/gui2/metadata/diff.py
index 32364da687..17e340dc65 100644
--- a/src/calibre/gui2/metadata/diff.py
+++ b/src/calibre/gui2/metadata/diff.py
@@ -213,6 +213,7 @@ class CommentsEdit(Editor):
 
     def __init__(self, field, is_new, parent, metadata, extra):
         Editor.__init__(self, parent, one_line_toolbar=False)
+        self.set_minimum_height_for_editor(150)
         self.is_new = is_new
         self.field = field
         self.metadata = metadata