diff --git a/Makefile b/Makefile
index cb60398..6e6e19c 100644
--- a/Makefile
+++ b/Makefile
@@ -42,18 +42,19 @@
 LOXI_TEMPLATE_FILES=$(shell find */templates -type f -a \
                                  \! \( -name '*.cache' -o -name '.*' \))
 INPUT_FILES = $(wildcard openflow_input/*)
+TEST_DATA = $(shell find test_data -name '*.data')
 
 all: c python
 
 c: .loxi_ts.c
 
-.loxi_ts.c: ${LOXI_PY_FILES} ${LOXI_TEMPLATE_FILES} ${INPUT_FILES}
+.loxi_ts.c: ${LOXI_PY_FILES} ${LOXI_TEMPLATE_FILES} ${INPUT_FILES ${TEST_DATA}
 	./loxigen.py --install-dir=${LOXI_OUTPUT_DIR} --lang=c
 	touch $@
 
 python: .loxi_ts.python
 
-.loxi_ts.python: ${LOXI_PY_FILES} ${LOXI_TEMPLATE_FILES} ${INPUT_FILES}
+.loxi_ts.python: ${LOXI_PY_FILES} ${LOXI_TEMPLATE_FILES} ${INPUT_FILES} ${TEST_DATA}
 	./loxigen.py --install-dir=${LOXI_OUTPUT_DIR} --lang=python
 	touch $@
 
@@ -68,7 +69,7 @@
 
 java: .loxi_ts.java
 
-.loxi_ts.java: ${LOXI_PY_FILES} ${LOXI_TEMPLATE_FILES} ${INPUT_FILES}
+.loxi_ts.java: ${LOXI_PY_FILES} ${LOXI_TEMPLATE_FILES} ${INPUT_FILES} ${TEST_DATA}
 	./loxigen.py --install-dir=${LOXI_OUTPUT_DIR} --lang=java
 	cd ${LOXI_OUTPUT_DIR}/openflowj; mvn package
 	touch $@