diff --git a/src/CP0/CP0.sv b/src/CP0/CP0.sv
index 920e761..02a5ad8 100644
--- a/src/CP0/CP0.sv
+++ b/src/CP0/CP0.sv
@@ -53,7 +53,7 @@ module CP0 (
   assign rf_cp0.Config.MT      = 3'b001;
   assign rf_cp0.Config.zero1   = 4'b0;
   assign rf_cp0.Cause.zero1    = 14'b0;
-  assign rf_cp0.Cause.IP[7:2]  = ext_int;
+  assign rf_cp0.Cause.IP[7:2]  = {rf_cp0.Cause.TI | ext_int[5], ext_int[4:0]};
   assign rf_cp0.Cause.zero2    = 1'b0;
   assign rf_cp0.Cause.zero3    = 2'b00;
   assign rf_cp0.Status.zero1   = 9'b0;