diff --git a/src/validator.ts b/src/validator.ts
index 69fb390d..d330ef67 100644
--- a/src/validator.ts
+++ b/src/validator.ts
@@ -39,6 +39,9 @@ rules.set('When minItems exists, minItems >= 0', schema => {
 
 rules.set('deprecated must be a boolean', schema => {
   const typeOfDeprecated = typeof schema.deprecated
+  if (schema.properties && 'deprecated' in schema.properties) {
+    return true
+  }
   return typeOfDeprecated === 'boolean' || typeOfDeprecated === 'undefined'
 })
 
diff --git a/test/__snapshots__/test/test.ts.md b/test/__snapshots__/test/test.ts.md
index 0d8b981b..c08ae578 100644
--- a/test/__snapshots__/test/test.ts.md
+++ b/test/__snapshots__/test/test.ts.md
@@ -863,6 +863,7 @@ Generated by [AVA](https://avajs.dev).
        */␊
       lastName?: string;␊
       description?: string;␊
+      deprecated?: boolean;␊
     }␊
     `
 
diff --git a/test/__snapshots__/test/test.ts.snap b/test/__snapshots__/test/test.ts.snap
index 79cd4741..c61a6116 100644
Binary files a/test/__snapshots__/test/test.ts.snap and b/test/__snapshots__/test/test.ts.snap differ
diff --git a/test/e2e/deprecated.ts b/test/e2e/deprecated.ts
index 6d8716f4..5e24999e 100644
--- a/test/e2e/deprecated.ts
+++ b/test/e2e/deprecated.ts
@@ -24,6 +24,11 @@ export const input = {
     description: {
       type: 'string',
     },
+    // https://github.com/bcherny/json-schema-to-typescript/issues/626
+    deprecated: {
+      default: false,
+      type: 'boolean',
+    },
   },
   additionalProperties: false,
   required: ['firstName'],