diff --git a/build/build.gradle b/build/build.gradle
index 25a70ba..04a5fd8 100644
--- a/build/build.gradle
+++ b/build/build.gradle
@@ -82,7 +82,7 @@ jar {
 }
 
 task sourceJar(type: Jar) {
-    from sourceSets.main.allSource
+    from sourceSets.main.java
     classifier = 'src'
 }