diff --git a/lib/filestack_rails/configuration.rb b/lib/filestack_rails/configuration.rb
index 74d23a5..ad59c41 100644
--- a/lib/filestack_rails/configuration.rb
+++ b/lib/filestack_rails/configuration.rb
@@ -3,7 +3,7 @@ class Configuration
     attr_accessor :api_key, :client_name, :secret_key, :security, :expiry, :app_secret, :cname
 
     def api_key
-      @api_key or raise "Set config.filepicker_rails.api_key"
+      @api_key or raise "Set config.filestack_rails.api_key"
     end
 
     def client_name
diff --git a/spec/lib/configuration_spec.rb b/spec/lib/configuration_spec.rb
index af0662d..e56a241 100644
--- a/spec/lib/configuration_spec.rb
+++ b/spec/lib/configuration_spec.rb
@@ -20,7 +20,7 @@
     it "raise error when @api_key is not defined" do
       expect do
         configuration.api_key
-      end.to raise_error(RuntimeError, "Set config.filepicker_rails.api_key")
+      end.to raise_error(RuntimeError, "Set config.filestack_rails.api_key")
     end
   end