diff --git a/src/vfs/tar/tar-internal.c b/src/vfs/tar/tar-internal.c
index 05f67e62e..d0691edc6 100644
--- a/src/vfs/tar/tar-internal.c
+++ b/src/vfs/tar/tar-internal.c
@@ -128,7 +128,7 @@ tar_flush_read (tar_super_t *archive)
     size_t status;
 
     status = mc_read (archive->fd, archive->record_start->buffer, record_size);
-    if (status == record_size)
+    if ((idx_t) status == record_size)
         return TRUE;
 
     return tar_short_read (status, archive);
@@ -286,7 +286,7 @@ stoint (const char *arg, char **arglim, gboolean *overflow, intmax_t minval, uin
                 v |= ckd_add (&i, i, *p - '0') ? 1 : 0;
             }
 
-            v |= maxval < i ? 1 : 0;
+            v |= maxval < (uintmax_t) i ? 1 : 0;
             if (v != 0)
                 i = maxval;
         }
diff --git a/src/vfs/tar/tar.c b/src/vfs/tar/tar.c
index a6003229e..185c9f4b8 100644
--- a/src/vfs/tar/tar.c
+++ b/src/vfs/tar/tar.c
@@ -327,7 +327,7 @@ tar_available_space_after (const union block *pointer)
 static read_header
 tar_checksum (const union block *header)
 {
-    int i;
+    unsigned int i;
     int unsigned_sum = 0;       /* the POSIX one :-) */
     int signed_sum = 0;         /* the Sun one :-( */
     int recorded_sum;