diff --git a/app/views/wiki/tex.rhtml b/app/views/wiki/tex.rhtml
index ec637222..8349b734 100644
--- a/app/views/wiki/tex.rhtml
+++ b/app/views/wiki/tex.rhtml
@@ -86,7 +86,13 @@
 % math-mode versions of \rlap, etc
 % from Alexander Perlis, "A complement to \smash, \llap, and lap"
 %   http://math.arizona.edu/~aprl/publications/mathclap/
-\def\clap#1{\hbox to 0pt{\hss#1\hss}}
\def\mathllap{\mathpalette\mathllapinternal}
\def\mathrlap{\mathpalette\mathrlapinternal}
\def\mathclap{\mathpalette\mathclapinternal}
\def\mathllapinternal#1#2{\llap{$\mathsurround=0pt#1{#2}$}}
\def\mathrlapinternal#1#2{\rlap{$\mathsurround=0pt#1{#2}$}}
\def\mathclapinternal#1#2{\clap{$\mathsurround=0pt#1{#2}$}}
+\def\clap#1{\hbox to 0pt{\hss#1\hss}}
+\def\mathllap{\mathpalette\mathllapinternal}
+\def\mathrlap{\mathpalette\mathrlapinternal}
+\def\mathclap{\mathpalette\mathclapinternal}
+\def\mathllapinternal#1#2{\llap{$\mathsurround=0pt#1{#2}$}}
+\def\mathrlapinternal#1#2{\rlap{$\mathsurround=0pt#1{#2}$}}
+\def\mathclapinternal#1#2{\clap{$\mathsurround=0pt#1{#2}$}}
 
 % Renames \sqrt as \oldsqrt and redefine root to result in \sqrt[#1]{#2}
 \let\oldroot\root
diff --git a/test/functional/wiki_controller_test.rb b/test/functional/wiki_controller_test.rb
index 6f0689fa..2c54000d 100755
--- a/test/functional/wiki_controller_test.rb
+++ b/test/functional/wiki_controller_test.rb
@@ -1010,7 +1010,13 @@ class WikiControllerTest < ActionController::TestCase
 % math-mode versions of \rlap, etc
 % from Alexander Perlis, "A complement to \smash, \llap, and lap"
 %   http://math.arizona.edu/~aprl/publications/mathclap/
-\def\clap#1{\hbox to 0pt{\hss#1\hss}}
\def\mathllap{\mathpalette\mathllapinternal}
\def\mathrlap{\mathpalette\mathrlapinternal}
\def\mathclap{\mathpalette\mathclapinternal}
\def\mathllapinternal#1#2{\llap{$\mathsurround=0pt#1{#2}$}}
\def\mathrlapinternal#1#2{\rlap{$\mathsurround=0pt#1{#2}$}}
\def\mathclapinternal#1#2{\clap{$\mathsurround=0pt#1{#2}$}}
+\def\clap#1{\hbox to 0pt{\hss#1\hss}}
+\def\mathllap{\mathpalette\mathllapinternal}
+\def\mathrlap{\mathpalette\mathrlapinternal}
+\def\mathclap{\mathpalette\mathclapinternal}
+\def\mathllapinternal#1#2{\llap{$\mathsurround=0pt#1{#2}$}}
+\def\mathrlapinternal#1#2{\rlap{$\mathsurround=0pt#1{#2}$}}
+\def\mathclapinternal#1#2{\clap{$\mathsurround=0pt#1{#2}$}}
 
 % Renames \sqrt as \oldsqrt and redefine root to result in \sqrt[#1]{#2}
 \let\oldroot\root