diff --git a/vendors/ocaml-tweetnacl/src/tweetnacl.ml b/vendors/ocaml-tweetnacl/src/tweetnacl.ml
index 0200fc77a..2456b73c0 100644
--- a/vendors/ocaml-tweetnacl/src/tweetnacl.ml
+++ b/vendors/ocaml-tweetnacl/src/tweetnacl.ml
@@ -326,10 +326,10 @@ module Sign = struct
     begin match seed with
       | None -> keypair pk sk
       | Some buf ->
-        if Bigstring.length buf < seedbytes then
-          invalid_arg "Sign.keypair: seed must be at least 32 bytes long" ;
-        Bigstring.blit buf 0 sk 0 pkbytes ;
-        keypair_seed pk sk
+          if Bigstring.length buf < seedbytes then
+            invalid_arg "Sign.keypair: seed must be at least 32 bytes long" ;
+          Bigstring.blit buf 0 sk 0 pkbytes ;
+          keypair_seed pk sk
     end ;
     Pk pk, Sk sk
 
diff --git a/vendors/ocaml-tweetnacl/test/test.ml b/vendors/ocaml-tweetnacl/test/test.ml
index b1e72fe7d..e16539ee7 100644
--- a/vendors/ocaml-tweetnacl/test/test.ml
+++ b/vendors/ocaml-tweetnacl/test/test.ml
@@ -26,7 +26,7 @@ let sign () =
   match Sign.verify ~key:pk signed_msg with
   | None -> assert false
   | Some verified_msg ->
-    Alcotest.check bigstring "sign" msg verified_msg
+      Alcotest.check bigstring "sign" msg verified_msg
 
 let sign_detached () =
   let pk, sk = Sign.keypair () in
@@ -42,7 +42,7 @@ let sign_extended () =
   match Sign.verify ~key:pk signed_msg with
   | None -> assert false
   | Some verified_msg ->
-    Alcotest.check bigstring "sign_extended" msg verified_msg
+      Alcotest.check bigstring "sign_extended" msg verified_msg
 
 let sign_extended_detached () =
   let pk, sk = Sign.keypair () in