diff --git a/spec/acceptance/cache_store_config_for_allow2ban_spec.rb b/spec/acceptance/cache_store_config_for_allow2ban_spec.rb
index ce994993..45f8f5c3 100644
--- a/spec/acceptance/cache_store_config_for_allow2ban_spec.rb
+++ b/spec/acceptance/cache_store_config_for_allow2ban_spec.rb
@@ -12,9 +12,11 @@
     end
   end
 
-  it "gives semantic error if no store was configured" do
-    assert_raises(Rack::Attack::MissingStoreError) do
-      get "/scarce-resource"
+  unless defined?(Rails)
+    it "gives semantic error if no store was configured" do
+      assert_raises(Rack::Attack::MissingStoreError) do
+        get "/scarce-resource"
+      end
     end
   end
 
diff --git a/spec/acceptance/cache_store_config_for_fail2ban_spec.rb b/spec/acceptance/cache_store_config_for_fail2ban_spec.rb
index 6fd79807..b46f9fe5 100644
--- a/spec/acceptance/cache_store_config_for_fail2ban_spec.rb
+++ b/spec/acceptance/cache_store_config_for_fail2ban_spec.rb
@@ -12,9 +12,11 @@
     end
   end
 
-  it "gives semantic error if no store was configured" do
-    assert_raises(Rack::Attack::MissingStoreError) do
-      get "/private-place"
+  unless defined?(Rails)
+    it "gives semantic error if no store was configured" do
+      assert_raises(Rack::Attack::MissingStoreError) do
+        get "/private-place"
+      end
     end
   end
 
diff --git a/spec/acceptance/cache_store_config_for_throttle_spec.rb b/spec/acceptance/cache_store_config_for_throttle_spec.rb
index 9be6e59a..a89b8272 100644
--- a/spec/acceptance/cache_store_config_for_throttle_spec.rb
+++ b/spec/acceptance/cache_store_config_for_throttle_spec.rb
@@ -9,9 +9,11 @@
     end
   end
 
-  it "gives semantic error if no store was configured" do
-    assert_raises(Rack::Attack::MissingStoreError) do
-      get "/", {}, "REMOTE_ADDR" => "1.2.3.4"
+  unless defined?(Rails)
+    it "gives semantic error if no store was configured" do
+      assert_raises(Rack::Attack::MissingStoreError) do
+        get "/", {}, "REMOTE_ADDR" => "1.2.3.4"
+      end
     end
   end
 
diff --git a/spec/acceptance/cache_store_config_with_rails_spec.rb b/spec/acceptance/cache_store_config_with_rails_spec.rb
index 3d9ac22f..66bb76a8 100644
--- a/spec/acceptance/cache_store_config_with_rails_spec.rb
+++ b/spec/acceptance/cache_store_config_with_rails_spec.rb
@@ -11,10 +11,12 @@
     end
   end
 
-  it "fails when Rails.cache is not set" do
-    Object.stub_const(:Rails, OpenStruct.new(cache: nil)) do
-      assert_raises(Rack::Attack::MissingStoreError) do
-        get "/", {}, "REMOTE_ADDR" => "1.2.3.4"
+  unless defined?(Rails)
+    it "fails when Rails.cache is not set" do
+      Object.stub_const(:Rails, OpenStruct.new(cache: nil)) do
+        assert_raises(Rack::Attack::MissingStoreError) do
+          get "/", {}, "REMOTE_ADDR" => "1.2.3.4"
+        end
       end
     end
   end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index f529e6a1..48ed7738 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -20,6 +20,7 @@ def safe_require(name)
 
 safe_require "connection_pool"
 safe_require "dalli"
+safe_require "rails"
 safe_require "redis"
 safe_require "redis-store"
 
@@ -27,7 +28,7 @@ class Minitest::Spec
   include Rack::Test::Methods
 
   before do
-    if Object.const_defined?(:Rails) && Rails.respond_to?(:cache)
+    if Object.const_defined?(:Rails) && Rails.respond_to?(:cache) && Rails.cache.respond_to?(:clear)
       Rails.cache.clear
     end
   end