diff -ru a/test/libgit2.jl b/test/libgit2.jl
--- a/test/libgit2.jl	2017-12-13 20:01:57.000000000 +0100
+++ b/test/libgit2.jl	2018-03-23 18:15:16.017762597 +0100
@@ -1697,7 +1697,7 @@
                             deserialize(f)
                         end
                         @test err.code == LibGit2.Error.ERROR
-                        @test err.msg == "Invalid Content-Type: text/plain"
+                        @test err.msg == "invalid Content-Type: text/plain"
                     end
                 finally
                     kill(pobj)