diff --git a/rv32_csrs.sv b/rv32_csrs.sv
index 1b190d0..dec4d21 100644
--- a/rv32_csrs.sv
+++ b/rv32_csrs.sv
@@ -65,7 +65,7 @@ module rv32_csrs (
         cycleh <= cycleh + &cycle;
         cycle <= cycle + 1;
 
-        instreth <= instreth + &instret;
+        instreth <= instreth + (&instret && instr_retired_in);
         instret <= instret + instr_retired_in;
     end
 endmodule