diff --git a/server/src/lib/score-import/framework/pb/create-pb-doc.ts b/server/src/lib/score-import/framework/pb/create-pb-doc.ts
index fe1c9fb9a..d4093ae80 100644
--- a/server/src/lib/score-import/framework/pb/create-pb-doc.ts
+++ b/server/src/lib/score-import/framework/pb/create-pb-doc.ts
@@ -2,7 +2,7 @@ import db from "external/mongo/db";
 import { KtLogger } from "lib/logger/logger";
 import { BulkWriteUpdateOneOperation } from "mongodb";
 import { integer, PBScoreDocument, ScoreDocument } from "tachi-common";
-import { IIDXMergeFn, SDVXMergeFn, USCMergeFn } from "./game-specific-merge";
+import { BMSMergeFn, IIDXMergeFn, SDVXMergeFn, USCMergeFn } from "./game-specific-merge";
 
 export type PBScoreDocumentNoRank = Omit<PBScoreDocument, "rankingData">;
 
@@ -109,6 +109,7 @@ const GAME_SPECIFIC_MERGE_FNS: Record<string, any> = {
 	iidx: IIDXMergeFn,
 	sdvx: SDVXMergeFn,
 	usc: USCMergeFn,
+	bms: BMSMergeFn,
 };
 
 async function MergeScoreLampIntoPB(
diff --git a/server/src/lib/score-import/framework/pb/game-specific-merge.ts b/server/src/lib/score-import/framework/pb/game-specific-merge.ts
index 1c85c5ad5..e24971ec3 100644
--- a/server/src/lib/score-import/framework/pb/game-specific-merge.ts
+++ b/server/src/lib/score-import/framework/pb/game-specific-merge.ts
@@ -59,6 +59,17 @@ export async function IIDXMergeFn(
 	return true;
 }
 
+export function BMSMergeFn(
+	pbDoc: PBScoreDocument<"bms:7K" | "bms:14K">,
+	scorePB: ScoreDocument<"bms:7K" | "bms:14K">,
+	lampPB: ScoreDocument<"bms:7K" | "bms:14K">,
+	logger: KtLogger
+) {
+	pbDoc.calculatedData.sieglinde = lampPB.calculatedData.sieglinde;
+
+	return true;
+}
+
 /**
  * This function recalculates and applies VF6 to the PB document.
  *