diff --git a/sphinx/texinputs/sphinx.sty b/sphinx/texinputs/sphinx.sty
index 209c35f9d..c0ea9d6eb 100644
--- a/sphinx/texinputs/sphinx.sty
+++ b/sphinx/texinputs/sphinx.sty
@@ -55,11 +55,10 @@
 \fi\fi
 
 % XeLaTeX can do colors, too
-\IfFileExists{ifxetex.sty}{\RequirePackage{ifxetex}}{}
-\ifx\ifxetex\undefined\else\ifxetex
+\ifx\XeTeXrevision\undefined\else
   \def\py@NormalColor{\color[rgb]{0.0,0.0,0.0}}
   \def\py@TitleColor{\color{TitleColor}}
-\fi\fi
+\fi
 
 % Increase printable page size (copied from fullpage.sty)
 \topmargin 0pt