diff --git a/lib/dune b/lib/dune
index 9860760b..5b58f3c2 100644
--- a/lib/dune
+++ b/lib/dune
@@ -18,3 +18,8 @@
  (name amount)
  (modules amount)
  (libraries angstrom fmt zarith))
+
+(library
+ (name headers_lib)
+ (modules headers_lib)
+ (libraries angstrom fmt))
diff --git a/src/headers_lib.ml b/lib/headers_lib.ml
similarity index 100%
rename from src/headers_lib.ml
rename to lib/headers_lib.ml
diff --git a/src/dune b/src/dune
index e5263d0d..b378bc9e 100644
--- a/src/dune
+++ b/src/dune
@@ -13,6 +13,7 @@
   b32
   include
   parse_config
+  headers_lib
   ;
   caqti
   caqti-miou