diff --git a/exercises/practice/bob/dune b/exercises/practice/bob/dune
index 3d0b594af7..91e03f9162 100644
--- a/exercises/practice/bob/dune
+++ b/exercises/practice/bob/dune
@@ -1,6 +1,6 @@
 (executable
  (name test)
- (libraries base oUnit))
+ (libraries base oUnit re re2))
 
 (alias
   (name    runtest)