diff --git a/tufte-common.sty b/tufte-common.sty
index 66c316e..f8b8a00 100644
--- a/tufte-common.sty
+++ b/tufte-common.sty
@@ -368,7 +368,7 @@
       \PackageInfo{\@tufte@pkgname}{XeTeX detected. Reverting to `soul' package for letterspacing.}
       \@tufte@loadsoul}
       {% use `soul' package for letterspacing
-      \PackageInfo{\tufte@pkgname}{Old version of pdfTeX detected.  Reverting to `soul' package for letterspacing.}
+      \PackageInfo{\@tufte@pkgname}{Old version of pdfTeX detected.  Reverting to `soul' package for letterspacing.}
       \@tufte@loadsoul}
   \else
     \IfFileExists{letterspace.sty}{%