diff --git a/src/calibre/ebooks/mobi/mobiml.py b/src/calibre/ebooks/mobi/mobiml.py
index da0da7c543..7a74bd9401 100644
--- a/src/calibre/ebooks/mobi/mobiml.py
+++ b/src/calibre/ebooks/mobi/mobiml.py
@@ -212,11 +212,11 @@ class MobiMLizer(object):
                 inline = etree.SubElement(inline, XHTML('sup'))
             elif valign == 'sub':
                 inline = etree.SubElement(inline, XHTML('sub'))
-            if istate.family == 'monospace':
-                inline = etree.SubElement(inline, XHTML('tt'))
-            if fsize != 3:
+            elif fsize != 3:
                 inline = etree.SubElement(inline, XHTML('font'),
                                           size=str(fsize))
+            if istate.family == 'monospace':
+                inline = etree.SubElement(inline, XHTML('tt'))
             if istate.italic:
                 inline = etree.SubElement(inline, XHTML('i'))
             if istate.bold: