diff --git a/tufte-common.sty b/tufte-common.sty
index f85e30a..8c2b04f 100644
--- a/tufte-common.sty
+++ b/tufte-common.sty
@@ -769,11 +769,11 @@
 
 \titleformat{\chapter}%
 	[display]% shape
-        {\relax\begin{fullwidth}}% format applied to label+text
+        {\relax\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\begin{fullwidth}}{}}% format applied to label+text
         {\itshape\fontsize{22}{24}\selectfont\thechapter}% label
         {0pt}% horizontal separation between label and title body
         {\fontsize{22}{24}\rm\itshape}% before the title body
-        [\end{fullwidth}]% after the title body
+        [\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\end{fullwidth}}{}]% after the title body