diff --git a/modulefile_template b/modulefile_template
index a7cf626..1ab74d5 100644
--- a/modulefile_template
+++ b/modulefile_template
@@ -17,4 +17,4 @@ Further details under https://cafe.psi.ch/mocha.html
 
 module load matlab/vmatlab
 
-prepend-path MATLABPATH "PREFIX/libexec"
+prepend-path MATLABPATH "$PREFIX/libexec"