diff --git a/build.gradle b/build.gradle
index d6118cd820..f0e60c21c2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -71,7 +71,8 @@ configure(subprojects) { subproject ->
 
     task sourcesJar(type: Jar, dependsOn:classes) {
         classifier = 'sources'
-        from sourceSets.main.allJava
+        from sourceSets.main.allJava.srcDirs
+        include '**/*.java', '**/*.aj'
     }
 
     task javadocJar(type: Jar) {