diff --git a/examples/sim/top_tracing_sim.core b/examples/sim/top_tracing_sim.core
index 43b64cd2..d318bcc5 100644
--- a/examples/sim/top_tracing_sim.core
+++ b/examples/sim/top_tracing_sim.core
@@ -22,4 +22,4 @@ targets:
       - ibex_tracing_tb
     tools:
       modelsim:
-        vlog_options: [-timescale=1ns/1ns]
+        vlog_options: [-timescale 1ns/1ns]