diff --git a/sys/sparc64/sparc64/machdep.c b/sys/sparc64/sparc64/machdep.c
index b7db7d729e0..4eb8d9c4cb0 100644
--- a/sys/sparc64/sparc64/machdep.c
+++ b/sys/sparc64/sparc64/machdep.c
@@ -496,8 +496,10 @@ sparc64_init(caddr_t mdp, u_long o1, u_long o2, u_long o3, ofw_vec_t *vec)
 
 	kdb_init();
 
+#ifdef KDB
 	if (boothowto & RB_KDB)
 		kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
+#endif
 }
 
 void