1 files changed, 3 insertions, 3 deletions

diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
index 560c8063c77c..b170b4704dc4 100644
--- a/arch/um/os-Linux/mem.c
+++ b/arch/um/os-Linux/mem.c
@@ -114,14 +114,14 @@ static void which_tmpdir(void)
         }
 
         while(1){
-                found = next(fd, buf, sizeof(buf) / sizeof(buf[0]), ' ');
+                found = next(fd, buf, ARRAY_SIZE(buf), ' ');
                 if(found != 1)
                         break;
 
                 if(!strncmp(buf, "/dev/shm", strlen("/dev/shm")))
                         goto found;
 
-                found = next(fd, buf, sizeof(buf) / sizeof(buf[0]), '\n');
+                found = next(fd, buf, ARRAY_SIZE(buf), '\n');
                 if(found != 1)
                         break;
         }
@@ -135,7 +135,7 @@ err:
         return;
 
 found:
-        found = next(fd, buf, sizeof(buf) / sizeof(buf[0]), ' ');
+        found = next(fd, buf, ARRAY_SIZE(buf), ' ');
         if(found != 1)
                 goto err;