diff --git a/Sources/PrivateInformationRetrieval/IndexPirProtocol.swift b/Sources/PrivateInformationRetrieval/IndexPirProtocol.swift
index 8364acf5..6153c3e3 100644
--- a/Sources/PrivateInformationRetrieval/IndexPirProtocol.swift
+++ b/Sources/PrivateInformationRetrieval/IndexPirProtocol.swift
@@ -277,12 +277,12 @@ public struct Query<Scheme: HeScheme>: Sendable {
 /// An index PIR response.
 public struct Response<Scheme: HeScheme>: Sendable {
     /// Ciphertexts in the response.
-    public let ciphertexts: [[Scheme.CanonicalCiphertext]]
+    public let ciphertexts: [[Scheme.CoeffCiphertext]]
 
     /// Initializes an index PIR ``Response``.
     /// - Parameter ciphertexts: Ciphertexts in the response.
     @inlinable
-    public init(ciphertexts: [[Scheme.CanonicalCiphertext]]) {
+    public init(ciphertexts: [[Scheme.CoeffCiphertext]]) {
         self.ciphertexts = ciphertexts
     }
 }
diff --git a/Sources/PrivateInformationRetrieval/MulPir.swift b/Sources/PrivateInformationRetrieval/MulPir.swift
index f293055a..4a9e6d25 100644
--- a/Sources/PrivateInformationRetrieval/MulPir.swift
+++ b/Sources/PrivateInformationRetrieval/MulPir.swift
@@ -311,7 +311,7 @@ extension MulPirServer {
                                                                 expandedRemainingQuery: ExpandedQueries,
                                                                 dataChunk: DataChunk,
                                                                 using evaluationKey: EvaluationKey<Scheme>) throws
-        -> CanonicalCiphertext
+        -> Ciphertext<Scheme, Coeff>
         where ExpandedQueries: Collection<CanonicalCiphertext>, DataChunk: Collection<Plaintext<Scheme, Eval>?>,
         ExpandedQueries.Index == Int, DataChunk.Index == Int
     {
@@ -341,7 +341,7 @@ extension MulPirServer {
             intermediateResults.count == 1,
             "There should be only 1 ciphertext in the final result for each chunk")
         try intermediateResults[0].modSwitchDownToSingle()
-        return intermediateResults[0]
+        return try intermediateResults[0].convertToCoeffFormat()
     }
 
     @inlinable
diff --git a/Sources/PrivateInformationRetrievalProtobuf/ConversionApi.swift b/Sources/PrivateInformationRetrievalProtobuf/ConversionApi.swift
index 31015a79..e3ae9315 100644
--- a/Sources/PrivateInformationRetrievalProtobuf/ConversionApi.swift
+++ b/Sources/PrivateInformationRetrievalProtobuf/ConversionApi.swift
@@ -22,10 +22,10 @@ extension Apple_SwiftHomomorphicEncryption_Api_V1_PIRResponse {
     /// - Returns: The converted native type.
     /// - Throws: Error upon invalid protobuf object.
     public func native<Scheme: HeScheme>(context: Context<Scheme>) throws -> Response<Scheme> {
-        let ciphertexts: [[Scheme.CanonicalCiphertext]] = try replies.map { reply in
+        let ciphertexts: [[Scheme.CoeffCiphertext]] = try replies.map { reply in
             let serializedCiphertexts: [SerializedCiphertext<Scheme.Scalar>] = try reply.native()
             return try serializedCiphertexts.map { serialized in
-                try Scheme.CanonicalCiphertext(deserialize: serialized, context: context, moduliCount: 1)
+                try Scheme.CoeffCiphertext(deserialize: serialized, context: context, moduliCount: 1)
             }
         }
         return Response(ciphertexts: ciphertexts)