diff --git a/backend/src/api/audit.ts b/backend/src/api/audit.ts
index e78b2796f..5aa04637d 100644
--- a/backend/src/api/audit.ts
+++ b/backend/src/api/audit.ts
@@ -144,7 +144,12 @@ class Audit {
 
     const numCensored = Object.keys(isCensored).length;
     const numMatches = matches.length - 1; // adjust for coinbase tx
-    const score = numMatches > 0 ? (numMatches / (numMatches + numCensored)) : 0;
+    let score = 0;
+    if (numMatches <= 0 && numCensored <= 0) {
+      score = 1;
+    } else if (numMatches > 0) {
+      score = (numMatches / (numMatches + numCensored));
+    }
     const similarity = projectedWeight ? matchedWeight / projectedWeight : 1;
 
     return {