diff --git a/test-r7rs.scm b/test-r7rs.scm
index b00df95..c195564 100755
--- a/test-r7rs.scm
+++ b/test-r7rs.scm
@@ -5,7 +5,7 @@
         (scheme process-context)
         (scheme read)
         (scheme write)
-        (trivial-tar-writer))
+        (lassik trivial-tar-writer))
 
 (define (slurp-binary-file filename)
   (call-with-port
diff --git a/trivial-tar-writer.sld b/trivial-tar-writer.sld
index a570df3..9018702 100644
--- a/trivial-tar-writer.sld
+++ b/trivial-tar-writer.sld
@@ -1,4 +1,4 @@
-(define-library (trivial-tar-writer)
+(define-library (lassik trivial-tar-writer)
   (export tar-owner
           tar-group
           tar-unix-mode