diff --git a/Source/santasyncservice/SNTSyncPostflight.mm b/Source/santasyncservice/SNTSyncPostflight.mm
index 93a4730c1..2779358dc 100644
--- a/Source/santasyncservice/SNTSyncPostflight.mm
+++ b/Source/santasyncservice/SNTSyncPostflight.mm
@@ -38,8 +38,8 @@ - (BOOL)sync {
   google::protobuf::Arena arena;
   auto req = google::protobuf::Arena::Create<::pbv1::PostflightRequest>(&arena);
   req->set_machine_id(NSStringToUTF8String(self.syncState.machineID));
-  req->set_rules_received(self.syncState.rulesReceived);
-  req->set_rules_processed(self.syncState.rulesProcessed);
+  req->set_rules_received(static_cast<uint32_t>(self.syncState.rulesReceived));
+  req->set_rules_processed(static_cast<uint32_t>(self.syncState.rulesProcessed));
 
   ::pbv1::PostflightResponse response;
   [self performRequest:[self requestWithMessage:req] intoMessage:&response timeout:30];
diff --git a/Source/santasyncservice/syncv1.proto b/Source/santasyncservice/syncv1.proto
index e06fc5045..380df51bf 100644
--- a/Source/santasyncservice/syncv1.proto
+++ b/Source/santasyncservice/syncv1.proto
@@ -305,8 +305,8 @@ message RuleDownloadResponse {
 }
 
 message PostflightRequest {
-  uint64 rules_received = 1   [json_name="rules_received"];
-  uint64 rules_processed = 2  [json_name="rules_processed"];
+  uint32 rules_received = 1   [json_name="rules_received"];
+  uint32 rules_processed = 2  [json_name="rules_processed"];
   // The UUID of the machine that is sending this postflight.
   string machine_id = 3       [json_name="machine_id"];
 }