diff --git a/lib/travis/api/v3/services/cron/create.rb b/lib/travis/api/v3/services/cron/create.rb
index f3ceb0e8..c7ce0c03 100644
--- a/lib/travis/api/v3/services/cron/create.rb
+++ b/lib/travis/api/v3/services/cron/create.rb
@@ -7,7 +7,7 @@ module Travis::API::V3
       raise LoginRequired unless access_control.logged_in? or access_control.full_access?
       raise NotFound      unless repository = find(:repository)
       raise NotFound      unless branch = find(:branch, repository)
-      raise ArgumentError, 'interval must be "daily", "weekly" or "monthly"' unless ["daily", "weekly", "monthly"].include?(params["interval"])
+      raise Error.new('Invalid value for interval. Interval must be "daily", "weekly" or "monthly"!', status: 422) unless ["daily", "weekly", "monthly"].include?(params["interval"])
       access_control.permissions(repository).create_cron!
 
       if branch.cron
diff --git a/spec/v3/services/cron/create_spec.rb b/spec/v3/services/cron/create_spec.rb
index 8b3b7a0c..115d2f95 100644
--- a/spec/v3/services/cron/create_spec.rb
+++ b/spec/v3/services/cron/create_spec.rb
@@ -55,11 +55,12 @@ describe Travis::API::V3::Services::Cron::Create do
   describe "creating a cron job with a wrong interval" do
     before     { last_cron }
     before     { Travis::API::V3::Models::Permission.create(repository: repo, user: repo.owner, push: true) }
-    it "raises an error" do
-     expect {
-       post("/v3/repo/#{repo.id}/branch/#{branch.name}/cron", wrong_options, headers)
-     }.to raise_error(ArgumentError, 'interval must be "daily", "weekly" or "monthly"')
-    end
+    before     { post("/v3/repo/#{repo.id}/branch/#{branch.name}/cron", wrong_options, headers) }
+    example    { expect(parsed_body).to be == {
+      "@type"         => "error",
+      "error_type"    => "error",
+      "error_message" => "Invalid value for interval. Interval must be \"daily\", \"weekly\" or \"monthly\"!"
+    }}
   end
 
   describe "try creating a cron job without login" do