diff --git a/gemfiles/Gemfile.rails-3.2-stable b/gemfiles/Gemfile.rails-3.2-stable
index f2f8a4ce..38ecac8f 100644
--- a/gemfiles/Gemfile.rails-3.2-stable
+++ b/gemfiles/Gemfile.rails-3.2-stable
@@ -24,8 +24,6 @@ platforms :ruby do
   gem "sqlite3"
 end
 
-platforms :mri_19, :mri_20 do
-  group :mongoid do
-    gem "mongoid", "~> 3.0"
-  end
+group :mongoid do
+  gem "mongoid", "~> 3.0"
 end
diff --git a/gemfiles/Gemfile.rails-4.0-stable b/gemfiles/Gemfile.rails-4.0-stable
index f7837cc1..140edd06 100644
--- a/gemfiles/Gemfile.rails-4.0-stable
+++ b/gemfiles/Gemfile.rails-4.0-stable
@@ -24,8 +24,6 @@ platforms :ruby do
   gem "sqlite3"
 end
 
-platforms :mri_19, :mri_20 do
-  group :mongoid do
-    gem "mongoid", github: "mongoid/mongoid", branch: "master"
-  end
+group :mongoid do
+  gem "mongoid", github: "mongoid/mongoid", branch: "master"
 end
diff --git a/gemfiles/Gemfile.rails-head b/gemfiles/Gemfile.rails-head
index d0146172..b69ee78f 100644
--- a/gemfiles/Gemfile.rails-head
+++ b/gemfiles/Gemfile.rails-head
@@ -24,8 +24,6 @@ platforms :ruby do
   gem "sqlite3"
 end
 
-platforms :mri_19, :mri_20 do
-  group :mongoid do
-    gem "mongoid", github: "mongoid/mongoid", branch: "master"
-  end
+group :mongoid do
+  gem "mongoid", github: "mongoid/mongoid", branch: "master"
 end