diff --git a/core/definitions.mk b/core/definitions.mk
index 2952ff6..4a6ec02 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2009,18 +2009,17 @@
 
 define transform-jar-to-jack
 	$(hide) mkdir -p $(dir $@)
-	$(JILL) $(PRIVATE_JILL_FLAGS) --output $@.tmpjill.jack $<
 	$(hide) mkdir -p $@.tmpjill.res
 	$(hide) unzip -qo $< -d $@.tmpjill.res
 	$(hide) find $@.tmpjill.res -iname "*.class" -delete
 	$(hide) $(call call-jack) \
+	    $(PRIVATE_JACK_FLAGS) \
         -D jack.import.resource.policy=keep-first \
         -D jack.import.type.policy=keep-first \
-	    --import $@.tmpjill.jack \
+	    --import $< \
 	    --import-resource $@.tmpjill.res \
 	    --output-jack $@
 	$(hide) rm -rf $@.tmpjill.res
-	$(hide) rm $@.tmpjill.jack
 endef
 
 # Moves $1.tmp to $1 if necessary. This is designed to be used with
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index bb14c04..3578c46 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -326,9 +326,14 @@
 endif # TARGET JAVA_LIBRARIES
 
 ifeq ($(LOCAL_MODULE_CLASS),JAVA_LIBRARIES)
-$(intermediates.COMMON)/classes.jack : PRIVATE_JILL_FLAGS:=$(LOCAL_JILL_FLAGS)
+
+ifneq ($(LOCAL_JILL_FLAGS),)
+$(error LOCAL_JILL_FLAGS is not supported any more, please use jack options in LOCAL_JACK_FLAGS instead)
+endif
+
+$(intermediates.COMMON)/classes.jack : PRIVATE_JACK_FLAGS:=$(LOCAL_JACK_FLAGS)
 $(intermediates.COMMON)/classes.jack : $(my_src_jar) $(LOCAL_MODULE_MAKEFILE_DEP) \
-        $(LOCAL_ADDITIONAL_DEPENDENCIES) $(JILL_JAR) $(JACK) | setup-jack-server
+        $(LOCAL_ADDITIONAL_DEPENDENCIES) $(JACK) | setup-jack-server
 	$(transform-jar-to-jack)
 
 # Update timestamps of .toc files for prebuilts so dependents will be