diff --git a/java/libraries/io/src/native/Makefile b/java/libraries/io/src/native/Makefile
index f33218a6c..c35acf87e 100644
--- a/java/libraries/io/src/native/Makefile
+++ b/java/libraries/io/src/native/Makefile
@@ -16,3 +16,5 @@ iface.h:
 
 clean:
 	rm -f $(TARGET) $(OBJS)
+
+.PHONY: iface.h clean