diff --git a/security/manager/ssl/src/nsNSSIOLayer.cpp b/security/manager/ssl/src/nsNSSIOLayer.cpp
index 3af7ae55b85..0f9ba97defd 100644
--- a/security/manager/ssl/src/nsNSSIOLayer.cpp
+++ b/security/manager/ssl/src/nsNSSIOLayer.cpp
@@ -1172,7 +1172,6 @@ uint32_t tlsIntoleranceTelemetryBucket(PRErrorCode err)
     case SSL_ERROR_NO_CYPHER_OVERLAP: return 7;
     case SSL_ERROR_BAD_SERVER: return 8;
     case SSL_ERROR_BAD_BLOCK_PADDING: return 9;
-    case SSL_ERROR_UNSUPPORTED_VERSION: return 10;
     case SSL_ERROR_PROTOCOL_VERSION_ALERT: return 11;
     case SSL_ERROR_RX_MALFORMED_FINISHED: return 12;
     case SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE: return 13;