diff --git a/vlib/os/file_test.v b/vlib/os/file_test.v
index 7c20af56e8..648c81c03c 100644
--- a/vlib/os/file_test.v
+++ b/vlib/os/file_test.v
@@ -360,7 +360,7 @@ fn test_tell() ? {
 		s := 'x'.repeat(size)
 		os.write_file(tfile, s) ?
 		fs := os.file_size(tfile)
-		assert fs == size
+		assert int(fs) == size
 		//
 		mut f := os.open_file(tfile, 'r') ?
 		f.seek(-5, .end) ?