diff --git a/packages/ember-glimmer/lib/syntax/input.ts b/packages/ember-glimmer/lib/syntax/input.ts
index 40e33507a74..7bf035fa7eb 100644
--- a/packages/ember-glimmer/lib/syntax/input.ts
+++ b/packages/ember-glimmer/lib/syntax/input.ts
@@ -165,8 +165,8 @@ export function inputMacro(_name: string, params: Option<WireFormat.Core.Params>
       if (Array.isArray(typeArg)) {
         // there is an AST plugin that converts this to an expression
         // it really should just compile in the component call too.
-        let inputTypeExpr = params.shift() as WireFormat.Expression;
-        builder.dynamicComponent(inputTypeExpr, params, hash, true, null, null);
+        let inputTypeExpr = params[0] as WireFormat.Expression;
+        builder.dynamicComponent(inputTypeExpr, params.slice(1), hash, true, null, null);
         return true;
       }
       if (typeArg === 'checkbox') {
diff --git a/packages/ember-glimmer/tests/integration/helpers/input-test.js b/packages/ember-glimmer/tests/integration/helpers/input-test.js
index a4c406f718d..8fa9f5f31d2 100644
--- a/packages/ember-glimmer/tests/integration/helpers/input-test.js
+++ b/packages/ember-glimmer/tests/integration/helpers/input-test.js
@@ -446,6 +446,22 @@ moduleFor('Helpers test: {{input}} with dynamic type', class extends InputRender
 
     this.assertAttr('type', 'text');
   }
+
+  ['@test GH16256 input macro does not modify params in place']() {
+    this.registerComponent('my-input', {
+      template: `{{input type=inputType}}`
+    });
+
+    this.render(`{{my-input inputType=firstType}}{{my-input inputType=secondType}}`, {
+      firstType: 'password',
+      secondType: 'email'
+    });
+
+    let inputs = this.element.querySelectorAll('input');
+    this.assert.equal(inputs.length, 2, 'there are two inputs');
+    this.assert.equal(inputs[0].getAttribute('type'), 'password');
+    this.assert.equal(inputs[1].getAttribute('type'), 'email');
+  }
 });
 
 moduleFor(`Helpers test: {{input type='checkbox'}}`, class extends InputRenderingTest {