diff --git a/src/interpreter/interpreter.rs b/src/interpreter/interpreter.rs
index 96620c9..fb4c594 100644
--- a/src/interpreter/interpreter.rs
+++ b/src/interpreter/interpreter.rs
@@ -889,8 +889,8 @@ impl Interpreter {
                 /*
                  * Repeat prefixes
                  */
-                Mnemonic::REPNZ(rep_op) => self.computer.repz(*rep_op, true)?,
-                Mnemonic::REPZ(rep_op) => self.computer.repz(*rep_op, false)?,
+                Mnemonic::REPNZ(rep_op) => self.computer.repz(*rep_op, false)?,
+                Mnemonic::REPZ(rep_op) => self.computer.repz(*rep_op, true)?,
 
                 /*
                  * Adjust