diff --git a/plugins/USBPrinting/avr_isp/chipDB.py b/plugins/USBPrinting/avr_isp/chipDB.py
index 891b5a394a..2da6586503 100644
--- a/plugins/USBPrinting/avr_isp/chipDB.py
+++ b/plugins/USBPrinting/avr_isp/chipDB.py
@@ -4,7 +4,7 @@ To support more chips add the relevant data to the avrChipDB list.
 This is a python 3 conversion of the code created by David Braam for the Cura project.
 """
 
-avrChipDB = {
+avr_chip_db = {
     "ATMega1280": {
             "signature": [0x1E, 0x97, 0x03],
             "pageSize": 128,
@@ -18,7 +18,7 @@ avrChipDB = {
 }
 
 def getChipFromDB(sig):
-    for chip in avrChipDB.values():
+    for chip in avr_chip_db.values():
         if chip["signature"] == sig:
             return chip
     return False
diff --git a/plugins/USBPrinting/avr_isp/ispBase.py b/plugins/USBPrinting/avr_isp/ispBase.py
index 8c816decbb..b5b5f8792e 100644
--- a/plugins/USBPrinting/avr_isp/ispBase.py
+++ b/plugins/USBPrinting/avr_isp/ispBase.py
@@ -45,13 +45,13 @@ class IspBase():
         """
         self.sendISP([0xAC, 0x80, 0x00, 0x00])
 
-    def writeFlash(self, flashData):
+    def writeFlash(self, flash_data):
         """
         Write the flash data, needs to be implemented in a subclass.
         """
         raise IspError("Called undefined writeFlash")
 
-    def verifyFlash(self, flashData):
+    def verifyFlash(self, flash_data):
         """
         Verify the flash data, needs to be implemented in a subclass.
         """