diff --git a/.changeset/chilled-apricots-allow.md b/.changeset/chilled-apricots-allow.md
new file mode 100644
index 0000000000..4650a5588c
--- /dev/null
+++ b/.changeset/chilled-apricots-allow.md
@@ -0,0 +1,5 @@
+---
+'@graphql-tools/utils': patch
+---
+
+pruneSchema will no longer removed used input object type.
diff --git a/packages/utils/src/prune.ts b/packages/utils/src/prune.ts
index 4ef14743a1..d774564e5c 100644
--- a/packages/utils/src/prune.ts
+++ b/packages/utils/src/prune.ts
@@ -139,7 +139,7 @@ function visitQueue(queue: string[], schema: GraphQLSchema, visited: Set<string>
         }
 
         for (const [, field] of entries) {
-          if (isInputObjectType(type)) {
+          if (isObjectType(type)) {
             for (const arg of field.args) {
               queue.push(getNamedType(arg.type).name); // Visit arg types
             }
diff --git a/packages/utils/tests/prune.test.ts b/packages/utils/tests/prune.test.ts
index 91834ca873..07c7f8542a 100644
--- a/packages/utils/tests/prune.test.ts
+++ b/packages/utils/tests/prune.test.ts
@@ -86,6 +86,20 @@ describe('pruneSchema', () => {
     expect(result.getType('CustomScalar')).toBeDefined();
   });
 
+  test('does not remove used input objects', () => {
+    const schema = buildSchema(/* GraphQL */ `
+      input UsedInput {
+        value: String
+      }
+
+      type Query {
+        foo(input: UsedInput): Boolean
+      }
+    `);
+    const result = pruneSchema(schema);
+    expect(result.getType('UsedInput')).toBeDefined();
+  });
+
   test('removes unused input objects', () => {
     const schema = buildSchema(/* GraphQL */ `
       input Unused {