diff --git a/java/src/com/tigervnc/vncviewer/Makefile b/java/src/com/tigervnc/vncviewer/Makefile
index ebc22e6..d68a49f 100644
--- a/java/src/com/tigervnc/vncviewer/Makefile
+++ b/java/src/com/tigervnc/vncviewer/Makefile
@@ -26,7 +26,7 @@
 
 all: $(CLASSES) $(ARCHIVE)
 
-$(CLASSES): $(SOURCES)
+$(CLASSES): $(SOURCES) ../rfb/*.java ../rdr/*.java
 	$(JC) $(JCFLAGS) -O $(SOURCES)
 
 $(ARCHIVE): $(CLASSES) $(MANIFEST) $(TIMESTAMP)