diff --git a/README.md b/README.md
index 552617ec3..1163d4b01 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Prerequisites: ocaml [http://ocaml.org], opam [http://opam.ocaml.org].
 
 Building:
 
-* `opam pin add GT https://github.com/dboulytchev/GT.git`
+* `opam pin add GT https://github.com/kakasu/GT.git#ppx`
 * `opam pin add ostap https://github.com/dboulytchev/ostap.git`
 * `opam install ostap`
 * `opam install GT`
diff --git a/regression/x86only/test001.expr b/regression/x86only/test001.expr
index 486bef831..50c3333a7 100644
--- a/regression/x86only/test001.expr
+++ b/regression/x86only/test001.expr
@@ -1,6 +1,6 @@
 fun insert (tree, value) {
   case tree of
-    `Empty                      -> return `Node (value, `Empty, `Empty)
+    `Empty -> return `Node (value, `Empty, `Empty)
   | `Node (x, left, right) ->
        if x > value
           then return `Node (x, insert (left, value), right)
diff --git a/regression/x86only/test002.expr b/regression/x86only/test002.expr
index 37616d334..cbfcab27b 100644
--- a/regression/x86only/test002.expr
+++ b/regression/x86only/test002.expr
@@ -1,7 +1,7 @@
 fun collect_ints_acc (v, tail) local i {
   case v of
     a@#unboxed -> return `cons (a, tail)
-  | #string  -> return tail
+  | #string    -> return tail
   | _       ->
      for i := 0, i < v.length, i := i + 1 do
        tail := collect_ints_acc (v[i], tail)