diff --git a/sys/pc98/apm/apm.c b/sys/pc98/apm/apm.c
index 44a4066f7a1..1eb910e86cc 100644
--- a/sys/pc98/apm/apm.c
+++ b/sys/pc98/apm/apm.c
@@ -592,7 +592,7 @@ apm_suspend(int state)
 	apm_lastreq_notify();
 }
 
-void
+static void
 apm_resume(void)
 {
 	struct apm_softc *sc = &apm_softc;