diff --git a/src/service/poc_lora.proto b/src/service/poc_lora.proto
index ff5727d2..6c315237 100644
--- a/src/service/poc_lora.proto
+++ b/src/service/poc_lora.proto
@@ -162,7 +162,7 @@ message lora_invalid_beacon_report_v1 {
   int32 elevation = 6;
   // provides any additional context for invalid reason
   // for example the deny list version used as part of the deny list check
-  string invalid_details = 7;
+  oneof invalid_details { string denied = 7; }
 }
 
 // tagged invalid witness report produced by the verifier
@@ -176,7 +176,7 @@ message lora_invalid_witness_report_v1 {
   invalid_participant_side participant_side = 4;
   // provides any additional context for invalid reason
   // for example the deny list version used as part of the deny list check
-  string invalid_details = 5;
+  oneof invalid_details { string denied = 5; }
 }
 
 // tagged verified witness report produced by the verifier
@@ -204,7 +204,7 @@ message lora_verified_witness_report_v1 {
   int32 elevation = 10;
   // provides any additional context for invalid reason
   // for example the deny list version used as part of the deny list check
-  string invalid_details = 11;
+  oneof invalid_details { string denied = 11; }
 }
 
 // POC report produced by the verifier