diff --git a/test/fixtures/prepare.js b/test/fixtures/prepare.js
index <HASH>..<HASH> 100755
--- a/test/fixtures/prepare.js
+++ b/test/fixtures/prepare.js
@@ -5,7 +5,8 @@ var path = require('path')
 var shell = require('shelljs')
 
 var JAVA = 'java -Djava.awt.headless=true -jar'
-var PLANTUML_JAR = path.join(__dirname, '../../vendor/plantuml.jar')
+var INCLUDED_PLANTUML_JAR = path.join(__dirname, '../../vendor/plantuml.jar')
+var PLANTUML_JAR = process.env.PLANTUML_HOME || INCLUDED_PLANTUML_JAR
 var TEST_PUML = path.join(__dirname, 'test.puml')
 
 shell.exec(JAVA + ' ' + PLANTUML_JAR + ' ' + TEST_PUML)
Make prepareation of fixtures use PLANTUML_HOME