diff --git a/core/cva6.sv b/core/cva6.sv
index d256d2065..c97e9a83a 100644
--- a/core/cva6.sv
+++ b/core/cva6.sv
@@ -1291,7 +1291,9 @@ module cva6
   logic [63:0] cycles;
 
   initial begin
-    f = $fopen("trace_hart_00.dasm", "w");
+    string fn;
+    $sformat(fn, "trace_hart_%0.0f.dasm", hart_id_i);
+    f = $fopen(fn, "w");
   end
 
   always_ff @(posedge clk_i or negedge rst_ni) begin