diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7012817eb2..7933259d26 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ All notable changes to this project will be documented in this file. The format
   - Language typo in the paper applications table ([#1965](https://github.com/bloom-housing/bloom/pull/1965)) (Jared White)
   - Improved UX for the Building Selection Criteria drawer ([#1994](https://github.com/bloom-housing/bloom/pull/1994)) (Jared White)
   - alternate contact email is validated ([#2035](https://github.com/bloom-housing/bloom/pull/2035)) (Yazeed)
+  - Incorrect last name ([#2107](https://github.com/bloom-housing/bloom/pull/2107)) (Dominik Barcikowski)
 
 ## Backend
 
diff --git a/sites/partners/lib/formatApplicationData.ts b/sites/partners/lib/formatApplicationData.ts
index cdde1f6214..6051234e38 100644
--- a/sites/partners/lib/formatApplicationData.ts
+++ b/sites/partners/lib/formatApplicationData.ts
@@ -83,7 +83,7 @@ export const mapFormToApi = (data: FormData, listingId: string, editMode: boolea
     const emailAddress: string | null = applicantData?.emailAddress || null
 
     applicantData.firstName = mapEmptyStringToNull(applicantData.firstName)
-    applicantData.lastName = mapEmptyStringToNull(applicantData.firstName)
+    applicantData.lastName = mapEmptyStringToNull(applicantData.lastName)
 
     const workAddress = getAddress(
       applicantData?.workInRegion === YesNoAnswer.Yes,