diff --git a/mediawiki/Dockerfile b/mediawiki/Dockerfile
index ddba6a8..bbd37d1 100644
--- a/mediawiki/Dockerfile
+++ b/mediawiki/Dockerfile
@@ -64,6 +64,9 @@ RUN for file in *.tar.gz; do \
         tar -xvf "$file" --directory /var/www/html/extensions/ && rm "$file"; \
     done
 
+# Set executable permissions for SyntaxHighlighting
+RUN chmod a+x /var/www/html/extensions/SyntaxHighlight_GeSHi/pygments/pygmentize
+
 # Install composer (AWS S3 & CheckUser extensions)
 RUN wget https://raw.githubusercontent.com/composer/getcomposer.org/76a7060ccb93902cd7576b67264ad91c8a2700e2/web/installer -O - -q | php -- --quiet \
     && mv composer.phar /usr/local/bin/composer