diff --git a/.travis.yml b/.travis.yml
index e58d66742..a9cfb599e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,9 @@ env:
   # Check build and unit tests
   # NOTE: testing needs OPAMBUILDTEST=true so that test deps are installed
   - TO_TEST=tests OPAMBUILDTEST=true OCAML_VERSION=4.02.3
+  - TO_TEST=tests OPAMBUILDTEST=true OCAML_VERSION=4.03.0
+  - TO_TEST=tests OPAMBUILDTEST=true OCAML_VERSION=4.04.2
+  - TO_TEST=tests OPAMBUILDTEST=true OCAML_VERSION=4.05.0
   - TO_TEST=tests OPAMBUILDTEST=true OCAML_VERSION=4.06.1
   - TO_TEST=tests OPAMBUILDTEST=true OCAML_VERSION=4.07.0
 before_install:
diff --git a/lib/compat.ml b/lib/compat.ml
index 767c09797..3c70201b6 100644
--- a/lib/compat.ml
+++ b/lib/compat.ml
@@ -99,7 +99,7 @@ end
 module Env = struct
   include Env
 
-#if OCAML_MAJOR = 4 && OCAML_MINOR < 3
+#if OCAML_MAJOR = 4 && OCAML_MINOR < 4
   (* Can't be overriden *)
   let without_cmis f x = f x
 #endif
diff --git a/lib/top/mdx_top.ml b/lib/top/mdx_top.ml
index 10300627e..539fa3c9f 100644
--- a/lib/top/mdx_top.ml
+++ b/lib/top/mdx_top.ml
@@ -124,7 +124,7 @@ module Phrase = struct
       | exception exn ->
         let exn = match Location.error_of_exn exn with
           | None -> raise exn
-#if OCAML_MAJOR >= 4 && OCAML_MINOR > 2
+#if OCAML_MAJOR >= 4 && OCAML_MINOR > 5
           | Some `Already_displayed -> raise exn
           | Some (`Ok error) ->
             Location.Error (Lexbuf.shift_location_error startpos error)