diff --git a/psipresentation.cls b/psipresentation.cls
index b019a28..efdf1ce 100644
--- a/psipresentation.cls
+++ b/psipresentation.cls
@@ -191,6 +191,8 @@ BoldItalicFont = *-Bold-Italic
 
 % frame
 
+\newcommand{\headspace}{0.09}
+
 \newcommand{\frametitlelogowidth}{0.075}
 \newcommand{\frametitlelogoupperedge}{0.96}
 \newcommand{\frametitlelogorightedge}{0.94}
@@ -237,7 +239,7 @@ BoldItalicFont = *-Bold-Italic
   \end{tikzpicture}
 
   % since the above is all overlay, simply add enough space to cover the head
-  \vskip 0.09\paperheight
+  \vskip\headspace\paperheight
 }