diff --git a/sys/fs/fat/fat.c b/sys/fs/fat/fat.c
index 9d87c30..c89fc42 100644
--- a/sys/fs/fat/fat.c
+++ b/sys/fs/fat/fat.c
@@ -106,8 +106,10 @@
     kprintf("SEEK FAILED!");
 
   size = fl_fread(data, size, 1, _file);
-  if (size >= 0)
-    fd->offset = offset + size;
+    if (size > 0)
+        fd->offset += size;
+    else
+        kprintf("[%s:%i] read_fat(0) FAILED!");
 
   /* Return */
   return (size);