diff --git a/py65/devices/mpu6502.py b/py65/devices/mpu6502.py
index c5d3a74..23b343c 100644
--- a/py65/devices/mpu6502.py
+++ b/py65/devices/mpu6502.py
@@ -299,9 +299,9 @@ class MPU:
         self.FlagsNZ(self.a)
 
     def opADC(self, x):
-        return self._opADC(x, flags_use_adjusted_result=False)
+        return self._opADC(x, decimal_flags_use_adjusted_result=False)
 
-    def _opADC(self, x, flags_use_adjusted_result):
+    def _opADC(self, x, decimal_flags_use_adjusted_result):
         data = self.ByteAt(x())
 
         if self.p & self.DECIMAL:
@@ -333,7 +333,7 @@ class MPU:
 
             self.p &= ~(self.CARRY | self.OVERFLOW | self.NEGATIVE | self.ZERO)
 
-            if flags_use_adjusted_result:  # 65C02 and 65816
+            if decimal_flags_use_adjusted_result:  # 65C02 and 65816
                 # Z and N use adjusted (i.e. decimal) result
                 zerores = adjresult
                 negativeres = adjresult
diff --git a/py65/devices/mpu65c02.py b/py65/devices/mpu65c02.py
index 5993f47..d0b309d 100644
--- a/py65/devices/mpu65c02.py
+++ b/py65/devices/mpu65c02.py
@@ -64,7 +64,7 @@ class MPU(mpu6502.MPU):
         self.memory[address] = m & ~self.a
 
     def opADC(self, x):
-        return self._opADC(x, flags_use_adjusted_result=True)
+        return self._opADC(x, decimal_flags_use_adjusted_result=True)
 
     def opSBC(self, x):
         return self._opSBC(x, decimal_flags_use_adjusted_result=True)