diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3842f236..e1e64a97 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- `username` to requests to upload prefill data
+
 ## [13.1.1] - 2026-03-31
 
 ### Added
diff --git a/src/classes/Forms.ts b/src/classes/Forms.ts
index d4270f13..d7da39c5 100644
--- a/src/classes/Forms.ts
+++ b/src/classes/Forms.ts
@@ -140,6 +140,15 @@ export default class Forms extends OneBlinkAPI {
       )
     }
 
+    const username = parameters.username
+    if (
+      username !== undefined &&
+      username !== null &&
+      typeof username !== 'string'
+    ) {
+      throw new TypeError('Must supply "username" as a string or not at all')
+    }
+
     let formsAppId = parameters.formsAppId
     if (
       typeof formsAppId !== 'number' &&
@@ -157,7 +166,6 @@ export default class Forms extends OneBlinkAPI {
     if (typeof formsAppId !== 'number') {
       throw new Error('This form has not been added to a forms app yet.')
     }
-
     const formsApp = await super.getRequest<FormsAppsTypes.FormsApp>(
       `/forms-apps/${formsAppId}`,
     )
@@ -174,11 +182,13 @@ export default class Forms extends OneBlinkAPI {
         },
       },
     }
+
     let preFillFormDataId
     if (parameters.preFillData) {
       const result = await this.oneBlinkUploader.uploadPrefillData({
         formId,
         prefillData: parameters.preFillData,
+        username,
       })
       preFillFormDataId = result.preFillFormDataId
 
@@ -189,15 +199,6 @@ export default class Forms extends OneBlinkAPI {
       }
     }
 
-    const username = parameters.username
-    if (
-      username !== undefined &&
-      username !== null &&
-      typeof username !== 'string'
-    ) {
-      throw new TypeError('Must supply "username" as a string or not at all')
-    }
-
     // Default expiry for token is 8 hours
     const jwtExpiry = expiryInSeconds || 28800
 
diff --git a/src/classes/Jobs.ts b/src/classes/Jobs.ts
index f3b58d75..ec7a1f85 100644
--- a/src/classes/Jobs.ts
+++ b/src/classes/Jobs.ts
@@ -87,6 +87,7 @@ export default class Jobs extends OneBlinkAPI {
         await this.oneBlinkUploader.uploadPrefillData({
           formId: data.formId,
           prefillData: preFillData,
+          username: data.username,
         })
       newJob.preFillFormDataId = preFillFormDataId
     }