--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -6,7 +6,7 @@
 require 'pp'
 require 'pry-byebug'
 
-MTEX2MML_FIXTURES_DIR = File.join('ext', 'mathematical', 'mtex2MML', 'tests', 'fixtures')
+MTEX2MML_FIXTURES_DIR = '/usr/share/mtex2MML/fixtures'
 MATHJAX_TEST_DIR = File.join(MTEX2MML_FIXTURES_DIR, 'MathJax')
 MATHJAX_TEX_DIR = File.join(MATHJAX_TEST_DIR, 'LaTeXToMathML-tex')
 TRAVIS_OSX = ENV['TRAVIS'] && ENV['TRAVIS_OS_NAME'] == 'osx'