diff --git a/src/core/cpu_core.cpp b/src/core/cpu_core.cpp
index 7a5ecf3e7..1f48ceb06 100644
--- a/src/core/cpu_core.cpp
+++ b/src/core/cpu_core.cpp
@@ -884,7 +884,7 @@ restart_instruction:
       }
 
       if constexpr (pgxp_mode >= PGXPMode::CPU)
-        PGXP::CPU_ANDI(inst.bits, new_value, ReadReg(inst.i.rs));
+        PGXP::CPU_ADDI(inst.bits, new_value, ReadReg(inst.i.rs));
 
       WriteReg(inst.i.rt, new_value);
     }