diff --git a/src/calibre/gui2/viewer/config.py b/src/calibre/gui2/viewer/config.py
index f4d23602ce..a744a2c1f9 100644
--- a/src/calibre/gui2/viewer/config.py
+++ b/src/calibre/gui2/viewer/config.py
@@ -82,6 +82,7 @@ def config(defaults=None):
     fonts('default_font_size', default=20, help=_('The standard font size in px'))
     fonts('mono_font_size', default=16, help=_('The monospaced font size in px'))
     fonts('standard_font', default='serif', help=_('The standard font type'))
+    fonts('minimum_font_size', default=8, help=_('The minimum font size in px'))
 
     return c
 
@@ -194,6 +195,7 @@ class ConfigDialog(QDialog, Ui_Dialog):
         self.sans_family.setCurrentFont(QFont(opts.sans_family))
         self.mono_family.setCurrentFont(QFont(opts.mono_family))
         self.default_font_size.setValue(opts.default_font_size)
+        self.minimum_font_size.setValue(opts.minimum_font_size)
         self.mono_font_size.setValue(opts.mono_font_size)
         self.standard_font.setCurrentIndex(
                 {'serif':0, 'sans':1, 'mono':2}[opts.standard_font])
@@ -266,6 +268,7 @@ class ConfigDialog(QDialog, Ui_Dialog):
         c.set('sans_family', unicode(self.sans_family.currentFont().family()))
         c.set('mono_family', unicode(self.mono_family.currentFont().family()))
         c.set('default_font_size', self.default_font_size.value())
+        c.set('minimum_font_size', self.minimum_font_size.value())
         c.set('mono_font_size', self.mono_font_size.value())
         c.set('standard_font', {0:'serif', 1:'sans', 2:'mono'}[
             self.standard_font.currentIndex()])
diff --git a/src/calibre/gui2/viewer/config.ui b/src/calibre/gui2/viewer/config.ui
index b36a5caceb..b146b571a2 100644
--- a/src/calibre/gui2/viewer/config.ui
+++ b/src/calibre/gui2/viewer/config.ui
@@ -210,6 +210,29 @@ QToolBox::tab:hover {
              </property>
             </widget>
            </item>
+           <item row="7" column="0">
+            <widget class="QLabel" name="label_22">
+             <property name="text">
+              <string>M&amp;inimum font size:</string>
+             </property>
+             <property name="buddy">
+              <cstring>minimum_font_size</cstring>
+             </property>
+            </widget>
+           </item>
+           <item row="7" column="1">
+            <widget class="QSpinBox" name="minimum_font_size">
+             <property name="toolTip">
+              <string>The minimum font size in pixels</string>
+             </property>
+             <property name="suffix">
+              <string> px</string>
+             </property>
+             <property name="minimum">
+              <number>8</number>
+             </property>
+            </widget>
+           </item>
           </layout>
          </widget>
          <widget class="QWidget" name="page_5">
@@ -573,8 +596,8 @@ QToolBox::tab:hover {
            <rect>
             <x>0</x>
             <y>0</y>
-            <width>811</width>
-            <height>352</height>
+            <width>352</width>
+            <height>151</height>
            </rect>
           </property>
           <attribute name="label">
diff --git a/src/calibre/gui2/viewer/documentview.py b/src/calibre/gui2/viewer/documentview.py
index 2086ae9b8a..1878b5e760 100644
--- a/src/calibre/gui2/viewer/documentview.py
+++ b/src/calibre/gui2/viewer/documentview.py
@@ -39,8 +39,8 @@ class Document(QWebPage): # {{{
         settings = self.settings()
         settings.setFontSize(QWebSettings.DefaultFontSize, opts.default_font_size)
         settings.setFontSize(QWebSettings.DefaultFixedFontSize, opts.mono_font_size)
-        settings.setFontSize(QWebSettings.MinimumLogicalFontSize, 8)
-        settings.setFontSize(QWebSettings.MinimumFontSize, 8)
+        settings.setFontSize(QWebSettings.MinimumLogicalFontSize, opts.minimum_font_size)
+        settings.setFontSize(QWebSettings.MinimumFontSize, opts.minimum_font_size)
         settings.setFontFamily(QWebSettings.StandardFont, {'serif':opts.serif_family, 'sans':opts.sans_family, 'mono':opts.mono_family}[opts.standard_font])
         settings.setFontFamily(QWebSettings.SerifFont, opts.serif_family)
         settings.setFontFamily(QWebSettings.SansSerifFont, opts.sans_family)