diff --git a/tests/org.eclipse.xtext.generator.tests/build.properties b/tests/org.eclipse.xtext.generator.tests/build.properties
index 34d2e4d2d..ae38034b4 100644
--- a/tests/org.eclipse.xtext.generator.tests/build.properties
+++ b/tests/org.eclipse.xtext.generator.tests/build.properties
@@ -1,4 +1,5 @@
-source.. = src/
+source.. = src/,\
+											src-gen/
 output.. = bin/
 bin.includes = META-INF/,\
                .