diff --git a/lib/aruba/api/commands.rb b/lib/aruba/api/commands.rb
index 7997cf75a..b2a5fadc0 100644
--- a/lib/aruba/api/commands.rb
+++ b/lib/aruba/api/commands.rb
@@ -210,7 +210,7 @@ def run_command_and_stop(cmd, opts = {})
       def type(input)
         return close_input if input == "\u0004"
 
-        last_command_started.write(input << "\n")
+        last_command_started.write("#{input}\n")
       end
 
       # Close stdin
diff --git a/spec/aruba/api/commands_spec.rb b/spec/aruba/api/commands_spec.rb
index 9a9f64fc7..06c9f7776 100644
--- a/spec/aruba/api/commands_spec.rb
+++ b/spec/aruba/api/commands_spec.rb
@@ -17,6 +17,12 @@
         expect(@aruba.last_command_started).to have_output "Hello"
       end
 
+      it "respond to frozen input" do
+        @aruba.type "Hello".freeze
+        @aruba.type "\u0004".freeze
+        expect(@aruba.last_command_started).to have_output "Hello"
+      end
+
       it "respond to close_input" do
         @aruba.type "Hello"
         @aruba.close_input