diff --git a/core/droiddoc.mk b/core/droiddoc.mk
index a70ab03..93d5551 100644
--- a/core/droiddoc.mk
+++ b/core/droiddoc.mk
@@ -175,6 +175,7 @@
 	$(hide) ( \
 		javadoc \
                 -encoding UTF-8 \
+                -source 1.8 \
                 \@$(PRIVATE_SRC_LIST_FILE) \
                 -J-Xmx1600m \
                 -XDignore.symbol.file \