diff --git a/build.gradle b/build.gradle
index 0c612c9..82d3d52 100644
--- a/build.gradle
+++ b/build.gradle
@@ -22,7 +22,8 @@ version = dexlib2Version + multidexlib2VersionSuffix
 
 sourceCompatibility = '1.7'
 def jdk = findProperty('JDK7_HOME') ?: '/usr/lib/jvm/java-7-openjdk-amd64'
-compileJava.options.bootClasspath = new File(jdk, 'jre/lib/rt.jar')
+def jdk_rt = new File(jdk, 'jre/lib/rt.jar')
+if (jdk_rt.exists()) compileJava.options.bootClasspath = jdk_rt
 
 repositories {
     jcenter()