diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 5597bd39e6b54a9f9d93ac914327c5eb1fb264ed..64fa062cc1192bd60178d035cfe2e9bad80d67a3 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -196,7 +196,7 @@ static void init_highmem(void)
 
 static void __init fixaddr_user_init( void)
 {
-#if CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
+#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
 	long size = FIXADDR_USER_END - FIXADDR_USER_START;
 	pgd_t *pgd;
 	pud_t *pud;