diff --git a/src/calibre/library/server/mobile.py b/src/calibre/library/server/mobile.py
index aa98412d27..51bfca204a 100644
--- a/src/calibre/library/server/mobile.py
+++ b/src/calibre/library/server/mobile.py
@@ -77,7 +77,7 @@ def build_navigation(start, num, total, url_base): # {{{
     right_buttons = TD(CLASS('button', style='text-align:right'))
 
     if start > 1:
-        for t,s in [('First', 1), ('Previous', max(start-(num+1),1))]:
+        for t,s in [('First', 1), ('Previous', max(start-num,1))]:
             left_buttons.append(A(t, href='%s;start=%d'%(url_base, s)))
 
     if total > start + num: