diff --git a/core/main.c b/core/main.c
index 92d56d3..90276f3 100644
--- a/core/main.c
+++ b/core/main.c
@@ -42,7 +42,7 @@ void idleThread(void *arg)
 
 
 #define FILE_HEADER_SIZE   16
-#define FILE_MAX_SIZE   64
+#define FILE_MAX_SIZE   64 // In nb of sectors
 void loadUserSpace()
 {
     struct ata_partition *part = ATAGetPartition(0);
@@ -52,7 +52,7 @@ void loadUserSpace()
         return;
     }
 
-    char *buf = malloc(FILE_MAX_SIZE * 512);
+    char *buf = malloc(FILE_MAX_SIZE * DISK_SECTOR_SIZE);
     if (buf == NULL) {
         printf("ENOMEM\n");
         return;