diff --git a/spec/multi_json/adapters/gson_spec.rb b/spec/multi_json/adapters/gson_spec.rb
index aef59ce..de9df97 100644
--- a/spec/multi_json/adapters/gson_spec.rb
+++ b/spec/multi_json/adapters/gson_spec.rb
@@ -1,4 +1,6 @@
 require "spec_helper"
+return unless RSpec.configuration.gson?
+
 require "shared/adapter"
 require "multi_json/adapters/gson"
 
diff --git a/spec/multi_json/adapters/jr_jackson_spec.rb b/spec/multi_json/adapters/jr_jackson_spec.rb
index e51d8f2..729bbe2 100644
--- a/spec/multi_json/adapters/jr_jackson_spec.rb
+++ b/spec/multi_json/adapters/jr_jackson_spec.rb
@@ -1,4 +1,6 @@
 require "spec_helper"
+return unless RSpec.configuration.jrjackson?
+
 require "shared/adapter"
 require "multi_json/adapters/jr_jackson"
 
diff --git a/spec/multi_json/adapters/oj_spec.rb b/spec/multi_json/adapters/oj_spec.rb
index 3f08a8a..4480b84 100644
--- a/spec/multi_json/adapters/oj_spec.rb
+++ b/spec/multi_json/adapters/oj_spec.rb
@@ -1,4 +1,6 @@
 require "spec_helper"
+return unless RSpec.configuration.oj?
+
 require "shared/adapter"
 require "multi_json/adapters/oj"
 
diff --git a/spec/multi_json/adapters/ok_json_spec.rb b/spec/multi_json/adapters/ok_json_spec.rb
index 94bc85a..6ad2dfa 100644
--- a/spec/multi_json/adapters/ok_json_spec.rb
+++ b/spec/multi_json/adapters/ok_json_spec.rb
@@ -1,4 +1,6 @@
 require "spec_helper"
+return unless RSpec.configuration.ok_json?
+
 require "shared/adapter"
 require "multi_json/adapters/ok_json"
 
diff --git a/spec/multi_json/adapters/yajl_spec.rb b/spec/multi_json/adapters/yajl_spec.rb
index 0928097..5b479b7 100644
--- a/spec/multi_json/adapters/yajl_spec.rb
+++ b/spec/multi_json/adapters/yajl_spec.rb
@@ -1,4 +1,6 @@
 require "spec_helper"
+return unless RSpec.configuration.yajl?
+
 require "shared/adapter"
 require "multi_json/adapters/yajl"