diff --git a/theme/ebook/pdf.css b/theme/ebook/pdf.css
index c094d85..b178be5 100644
--- a/theme/ebook/pdf.css
+++ b/theme/ebook/pdf.css
@@ -42,11 +42,11 @@ body .page li {
 }
 
 body .page pre {
-	font-size: 11px;
+	font-size: 13px;
 }
 
 body .page code {
-	font-size: 11px;
+	font-size: 13px;
 	font-family: 'Liberation Mono';
 }