diff --git a/.gitignore b/.gitignore
index b7fb334..6e7429c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,5 +5,5 @@
 can/*.so
 can/build/
 can/obj/
-can/packer_impl.cpp
+can/packer_pyx.cpp
 can/parser_pyx.cpp
diff --git a/can/SConscript b/can/SConscript
index a16ca15..67c644b 100644
--- a/can/SConscript
+++ b/can/SConscript
@@ -17,12 +17,11 @@ for x in os.listdir('../'):
 libdbc = env.SharedLibrary('libdbc', ["dbc.cc", "parser.cc", "packer.cc", "common.cc"]+dbcs, LIBS=["capnp", "kj"])
 
 # packer
-env.Command(['packer_impl.so'],
-  ['packer_impl.pyx', 'packer_setup.py'],
-  "cd opendbc/can && python3 packer_setup.py build_ext --inplace")
+env.Command(['packer_pyx.so'],
+  ['packer_pyx.pyx', 'packer_pyx_setup.py'],
+  "cd opendbc/can && python3 packer_pyx_setup.py build_ext --inplace")
 
 # parser
 env.Command(['parser_pyx.so'],
   [libdbc, cereal, 'parser_pyx_setup.py', 'parser_pyx.pyx', 'common.pxd'],
   "cd opendbc/can && python3 parser_pyx_setup.py build_ext --inplace")
-
diff --git a/can/packer.py b/can/packer.py
index b136ca9..fc22cce 100644
--- a/can/packer.py
+++ b/can/packer.py
@@ -1,3 +1,3 @@
 # pylint: skip-file
-from opendbc.can.packer_impl import CANPacker
+from opendbc.can.packer_pyx import CANPacker
 assert CANPacker
diff --git a/can/packer_impl.pyx b/can/packer_pyx.pyx
similarity index 100%
rename from can/packer_impl.pyx
rename to can/packer_pyx.pyx
diff --git a/can/packer_setup.py b/can/packer_pyx_setup.py
similarity index 70%
rename from can/packer_setup.py
rename to can/packer_pyx_setup.py
index 8b25e60..82b10b0 100644
--- a/can/packer_setup.py
+++ b/can/packer_pyx_setup.py
@@ -6,4 +6,4 @@ from common.cython_hacks import BuildExtWithoutPlatformSuffix
 
 setup(name='CAN Packer API Implementation',
       cmdclass={'build_ext': BuildExtWithoutPlatformSuffix},
-      ext_modules=cythonize(Extension("packer_impl", ["packer_impl.pyx"], language="c++", extra_compile_args=["-std=c++11"])))
+      ext_modules=cythonize(Extension("packer_pyx", ["packer_pyx.pyx"], language="c++", extra_compile_args=["-std=c++11"])))
diff --git a/can/tests/test_packer_parser.py b/can/tests/test_packer_parser.py
index d725776..1c28e88 100644
--- a/can/tests/test_packer_parser.py
+++ b/can/tests/test_packer_parser.py
@@ -4,7 +4,27 @@ import unittest
 
 from opendbc.can.parser import CANParser
 from opendbc.can.packer import CANPacker
-from opendbc.boardd.boardd import can_list_to_can_capnp
+import cereal.messaging as messaging
+
+
+# Python implementation so we don't have to depend on boardd
+def can_list_to_can_capnp(can_msgs, msgtype='can'):
+  dat = messaging.new_message()
+  dat.init(msgtype, len(can_msgs))
+
+  for i, can_msg in enumerate(can_msgs):
+    if msgtype == 'sendcan':
+      cc = dat.sendcan[i]
+    else:
+      cc = dat.can[i]
+
+    cc.address = can_msg[0]
+    cc.busTime = can_msg[1]
+    cc.dat = bytes(can_msg[2])
+    cc.src = can_msg[3]
+
+  return dat.to_bytes()
+
 
 class TestCanParserPacker(unittest.TestCase):
   def test_civic(self):