diff --git a/src/runtime/os_plan9.go b/src/runtime/os_plan9.go
index b534cdba5d..2bea1058f2 100644
--- a/src/runtime/os_plan9.go
+++ b/src/runtime/os_plan9.go
@@ -293,7 +293,6 @@ func osinit() {
 	ncpu = getproccount()
 	physPageSize = getPageSize()
 	getg().m.procid = getpid()
-	notify(unsafe.Pointer(funcPC(sigtramp)))
 }
 
 //go:nosplit
@@ -311,6 +310,9 @@ func goenvs() {
 }
 
 func initsig(preinit bool) {
+	if !preinit {
+		notify(unsafe.Pointer(funcPC(sigtramp)))
+	}
 }
 
 //go:nosplit