diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 31c19a79738d0fc73ef418126c8a4789e364b70d..a829dc8d7a9ec0d6340349c11f883fe2c785ebb5 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -84,7 +84,7 @@ extern int latencytop_enabled;
 extern int sysctl_nr_open_min, sysctl_nr_open_max;
 
 /* Constants used for minimum and  maximum */
-#ifdef CONFIG_HIGHMEM
+#if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
 static int one = 1;
 #endif