diff --git a/code/index/java/nu/marginalia/index/results/IndexResultRankingService.java b/code/index/java/nu/marginalia/index/results/IndexResultRankingService.java
index 810a1880..16d8a937 100644
--- a/code/index/java/nu/marginalia/index/results/IndexResultRankingService.java
+++ b/code/index/java/nu/marginalia/index/results/IndexResultRankingService.java
@@ -6,6 +6,7 @@ import gnu.trove.list.TLongList;
 import gnu.trove.list.array.TLongArrayList;
 import gnu.trove.map.hash.TObjectLongHashMap;
 import it.unimi.dsi.fastutil.longs.LongArrayList;
+import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
 import nu.marginalia.api.searchquery.*;
 import nu.marginalia.api.searchquery.model.compiled.CompiledQuery;
 import nu.marginalia.api.searchquery.model.compiled.CqDataLong;
@@ -174,6 +175,7 @@ public class IndexResultRankingService {
         }
 
         List<RpcDecoratedResultItem> resultItems = new ArrayList<>(resultsList.size());
+        LongOpenHashSet seenDocumentHashes = new LongOpenHashSet(resultsList.size());
 
         // Decorate the results with the document details
         for (var result : resultsList) {
@@ -185,6 +187,11 @@ public class IndexResultRankingService {
                 continue;
             }
 
+            // Filter out duplicates by content
+            if (!seenDocumentHashes.add(docData.dataHash())) {
+                continue;
+            }
+
             var rawItem = RpcRawResultItem.newBuilder();
 
             rawItem.setCombinedId(result.combinedId);