diff --git a/core/tasks/cts.mk b/core/tasks/cts.mk
index 108e30b..5b041d6 100644
--- a/core/tasks/cts.mk
+++ b/core/tasks/cts.mk
@@ -75,6 +75,7 @@
 define generate-core-test-description
 @echo "Generate core-test description ("$(notdir $(1))")"
 $(hide) java -Xmx256M \
+	-Xbootclasspath/a:$(PRIVATE_CLASSPATH) \
 	-classpath $(PRIVATE_CLASSPATH):$(HOST_OUT_JAVA_LIBRARIES)/descGen.jar:$(HOST_JDK_TOOLS_JAR) \
 	$(PRIVATE_PARAMS) CollectAllTests $(1) $(2) $(3) "$(4)" $(5) $(6)
 endef