diff --git a/mozilla/extensions/java/xpcom/interfaces/Makefile.in b/mozilla/extensions/java/xpcom/interfaces/Makefile.in
index 66a6d3ef987..55ce06fa0a7 100644
--- a/mozilla/extensions/java/xpcom/interfaces/Makefile.in
+++ b/mozilla/extensions/java/xpcom/interfaces/Makefile.in
@@ -113,13 +113,13 @@ endif
 
 # Using the temporary "java.files" avoids an "argument list too long"
 # error on Windows when using *.java
-$(IFACES_DIR)/$(JAVA_IFACES_PKG_NAME)/nsISupports.class: $(IFACES_DIR) Makefile Makefile.in
+$(IFACES_DIR)/$(JAVA_IFACES_PKG_NAME)/nsISupports.class: $(IFACES_DIR) $(wildcard $(JAVA_DIST_DIR)/default/$(JAVA_IFACES_PKG_NAME)/*.java) Makefile Makefile.in
 	@echo Compiling Java interfaces
 	find $(JAVA_DIST_DIR)/default -name "*.java" $(IGNORE_IFACES) > java.files
 	$(CYGWIN_WRAPPER) $(JAVAC) $(JAVAC_FLAGS) -classpath $(IFACES_DIR) 		\
 		-d $(IFACES_DIR) -sourcepath $(JAVA_DIST_DIR)/default @java.files
 
-$(IFACES_JAR): $(IFACES_DIR)/$(JAVA_IFACES_PKG_NAME)/nsISupports.class $(wildcard $(JAVA_DIST_DIR)/default/$(JAVA_IFACES_PKG_NAME)/*.java) Makefile
+$(IFACES_JAR): $(IFACES_DIR)/$(JAVA_IFACES_PKG_NAME)/nsISupports.class Makefile
 	$(JAR) cf $@ -C $(IFACES_DIR) org
 
 $(IFACES_JAR_SRC): $(IFACES_JAR)