diff --git a/src/calibre/gui2/actions/tweak_epub.py b/src/calibre/gui2/actions/tweak_epub.py
index 2f8eeb02d3..8ce8b2a7d3 100755
--- a/src/calibre/gui2/actions/tweak_epub.py
+++ b/src/calibre/gui2/actions/tweak_epub.py
@@ -22,7 +22,7 @@ class Choose(QDialog):
         self.setWindowTitle(_('Choose format to tweak'))
 
         self.la = la = QLabel(_(
-            'This book mas multiple formats that can be tweaked. Choose the format you want to tweak.'))
+            'This book has multiple formats that can be tweaked. Choose the format you want to tweak.'))
         l.addWidget(la)
 
         self.rem = QCheckBox(_('Always ask when more than one format is available'))