diff --git a/ptbposter/ptbposter.cls b/ptbposter/ptbposter.cls
index 525e454f9a602ce65e6a8a1f9d5bde62e385ec51..96c085c94eee844d716dabab1b881e59f9f9f695 100644
--- a/ptbposter/ptbposter.cls
+++ b/ptbposter/ptbposter.cls
@@ -428,7 +428,7 @@
   \setlength\PTB@leftmargin{0.5\dimexpr\paperwidth-\PTB@framewidth}%
   \edef\PTB@tempa{%
     \noexpand\newgeometry{%
-      columnsep=2em,hcentering,%
+      columnsep=1.5em,hcentering,%
       top=\the\dimexpr\PTB@topmargin+\PTB@textvsep,%
       textwidth=\the\dimexpr\PTB@framewidth-2\PTB@texthsep,%
       textheight=\the\dimexpr\PTB@frameheight-2\PTB@textvsep}%