diff --git a/.changeset/strange-nails-ring.md b/.changeset/strange-nails-ring.md
new file mode 100644
index 00000000..8e8474f3
--- /dev/null
+++ b/.changeset/strange-nails-ring.md
@@ -0,0 +1,5 @@
+---
+'gql.tada': patch
+---
+
+Handle inference of input object fields with missing `defaultValue` properties in introspection.
diff --git a/src/__tests__/fixtures/simpleIntrospection.ts b/src/__tests__/fixtures/simpleIntrospection.ts
index 6a5cb494..b3c833b9 100644
--- a/src/__tests__/fixtures/simpleIntrospection.ts
+++ b/src/__tests__/fixtures/simpleIntrospection.ts
@@ -28,6 +28,17 @@ export type simpleIntrospection = {
             },
             defaultValue: null,
           },
+          {
+            name: 'description',
+            type: {
+              kind: 'NON_NULL',
+              ofType: {
+                kind: 'SCALAR',
+                name: 'String',
+                ofType: null,
+              },
+            },
+          },
           {
             name: 'complete',
             type: {
diff --git a/src/__tests__/fixtures/simpleSchema.ts b/src/__tests__/fixtures/simpleSchema.ts
index 85c07194..bf772c62 100644
--- a/src/__tests__/fixtures/simpleSchema.ts
+++ b/src/__tests__/fixtures/simpleSchema.ts
@@ -231,6 +231,17 @@ export type simpleSchema = {
           };
           defaultValue: null;
         },
+        {
+          name: 'description';
+          type: {
+            kind: 'NON_NULL';
+            ofType: {
+              kind: 'SCALAR';
+              name: 'String';
+              ofType: null;
+            };
+          };
+        },
         {
           name: 'complete';
           type: {
diff --git a/src/__tests__/variables.test-d.ts b/src/__tests__/variables.test-d.ts
index 0b4ea343..8fc6e039 100644
--- a/src/__tests__/variables.test-d.ts
+++ b/src/__tests__/variables.test-d.ts
@@ -29,7 +29,7 @@ describe('getVariablesType', () => {
 
     expectTypeOf<variables>().toEqualTypeOf<{
       id: string | number;
-      input: { title: string; complete?: boolean | null };
+      input: { title: string; complete?: boolean | null; description: string };
     }>();
   });
 
@@ -93,7 +93,7 @@ describe('getScalarType', () => {
   });
 
   it('gets the type of an input object', () => {
-    type expected = { title: string; complete?: boolean | null };
+    type expected = { title: string; complete?: boolean | null; description: string };
     expectTypeOf<getScalarType<'TodoPayload', schema>>().toEqualTypeOf<expected>();
   });
 });
diff --git a/src/variables.ts b/src/variables.ts
index fedbb97c..754ea24f 100644
--- a/src/variables.ts
+++ b/src/variables.ts
@@ -12,7 +12,7 @@ type getInputObjectTypeRec<
       Rest,
       Introspection,
       (InputField extends { name: any; type: any }
-        ? InputField extends { defaultValue: undefined | null; type: { kind: 'NON_NULL' } }
+        ? InputField extends { defaultValue?: undefined | null; type: { kind: 'NON_NULL' } }
           ? { [Name in InputField['name']]: unwrapType<InputField['type'], Introspection> }
           : { [Name in InputField['name']]?: unwrapType<InputField['type'], Introspection> | null }
         : {}) &