diff --git a/src/lib/registrar.js b/src/lib/registrar.js
index 844af12..80a3cbd 100644
--- a/src/lib/registrar.js
+++ b/src/lib/registrar.js
@@ -70,8 +70,17 @@ export async function findTldOwnerAddress(client, tld, prefix = REGISTRAR.addres
  */
 export function splitServiceFee(serviceFeeSats) {
   const total = BigInt(serviceFeeSats ?? 0n);
-  const tldOwner = (total * TLD_OWNER_SHARE_NUM) / TLD_OWNER_SHARE_DEN;
-  const platform = total - tldOwner;
+  let tldOwner = (total * TLD_OWNER_SHARE_NUM) / TLD_OWNER_SHARE_DEN;
+  let platform = total - tldOwner;
+  // An output below the dust limit is rejected by the network, so a cheap
+  // name's split would make its registration unmineable. The small share
+  // then goes with the big one: the TLD owner keeps all of a fee whose
+  // platform share is dust, and the platform keeps all of a fee that is
+  // too small to split at all.
+  const DUST = 546n;
+  if (platform > 0n && platform < DUST) { tldOwner = total; platform = 0n; }
+  if (tldOwner > 0n && tldOwner < DUST) { platform = total; tldOwner = 0n; }
+  if (platform < DUST) platform = 0n; // a fee below the dust limit cannot be paid at all
   return { tldOwnerFeeSats: tldOwner, platformFeeSats: platform };
 }