diff --git a/repos/os/run/log_core.run b/repos/os/run/log_core.run
index ea4e4fc007..f0f86b3c95 100644
--- a/repos/os/run/log_core.run
+++ b/repos/os/run/log_core.run
@@ -14,6 +14,8 @@ proc log_service { } {
 
 if {[have_spec nova]} {
 	proc kernel_output { } { return "novga logmem" }
+	# differs because \n is missing, since kernel serial is off
+	proc run_boot_string { } { return "Hypervisor reports "}
 }
 
 build "core init drivers/timer server/vfs server/fs_log app/log_core"