Chess: fixed warning
diff --git a/examples/org.eclipse.graphiti.examples.chess/build.properties b/examples/org.eclipse.graphiti.examples.chess/build.properties
index e9863e2..c948997 100644
--- a/examples/org.eclipse.graphiti.examples.chess/build.properties
+++ b/examples/org.eclipse.graphiti.examples.chess/build.properties
@@ -1,4 +1,5 @@
-source.. = src/
+source.. = src/,\
+           src-gen/
 output.. = bin/
 bin.includes = META-INF/,\
                .,\