diff --git a/crypto/ics/cryptfs.c b/crypto/ics/cryptfs.c
index 945864d..d994449 100644
--- a/crypto/ics/cryptfs.c
+++ b/crypto/ics/cryptfs.c
@@ -211,7 +211,7 @@
     /* the footer size is bigger than we expected.
      * Skip to it's stated end so we can read the key.
      */
-    if (lseek(fd, crypt_ftr->ftr_size - sizeof(struct crypt_mnt_ftr),  SEEK_CUR) == -1) {
+    if (lseek64(fd, crypt_ftr->ftr_size - sizeof(struct crypt_mnt_ftr),  SEEK_CUR) == -1) {
       printf("Cannot seek to start of key\n");
       goto errout;
     }