diff --git a/latex/thesis.cls b/latex/thesis.cls
index 4e3d8a5..4c3efb2 100644
--- a/latex/thesis.cls
+++ b/latex/thesis.cls
@@ -143,6 +143,7 @@
 }
 \fancypagestyle{fancyplain}{%
     \fancyhf{}
+    \setlength{\headheight}{15pt} % to avoid fancyhdr warning
     \renewcommand{\headrulewidth}{0pt}
     \fancyhead[R]{\thepage}
 }