diff --git a/Processor.cs b/Processor.cs
index 0c05e5d..4c2ea0d 100644
--- a/Processor.cs
+++ b/Processor.cs
@@ -452,6 +452,10 @@ public bool Step()
                         default:
                             throw new InvalidOperationException($"{opcodeLow:X} is not a recognised division low opcode");
                     }
+                    if ((Registers[Data.Register.rsf] & 0b10) != 0)
+                    {
+                        Registers[Data.Register.rsf] ^= 0b10;
+                    }
                     if (Registers[targetRegister] == 0)
                     {
                         Registers[Data.Register.rsf] |= 0b1;
@@ -591,6 +595,10 @@ public bool Step()
                         default:
                             throw new InvalidOperationException($"{opcodeLow:X} is not a recognised bitwise low opcode");
                     }
+                    if ((Registers[Data.Register.rsf] & 0b10) != 0)
+                    {
+                        Registers[Data.Register.rsf] ^= 0b10;
+                    }
                     if (Registers[targetRegister] == 0)
                     {
                         Registers[Data.Register.rsf] |= 0b1;