diff --git a/api/server/src/main/java/org/softwareheritage/graph/backend/NodeIdMap.java b/api/server/src/main/java/org/softwareheritage/graph/backend/NodeIdMap.java
index fe887d7..3beacd3 100644
--- a/api/server/src/main/java/org/softwareheritage/graph/backend/NodeIdMap.java
+++ b/api/server/src/main/java/org/softwareheritage/graph/backend/NodeIdMap.java
@@ -1,74 +1,74 @@
 package org.softwareheritage.graph.backend;
 
 import java.io.IOException;
 
 import org.softwareheritage.graph.SwhId;
 import org.softwareheritage.graph.backend.utils.MMapInputFile;
 
 public class NodeIdMap {
-  public static final int SWH_ID_LENGTH = 40;
+  public static final int SWH_ID_LENGTH = 50;
   public static final int NODE_ID_LENGTH = 20;
   // +1 are for spaces and end of lines
   public static final int SWH_TO_NODE_LINE_LENGTH = SWH_ID_LENGTH + 1 + NODE_ID_LENGTH + 1;
   public static final int NODE_TO_SWH_LINE_LENGTH = SWH_ID_LENGTH + 1;
 
   String graphPath;
   long nbIds;
   MMapInputFile swhToNodeMap;
   MMapInputFile nodeToSwhMap;
 
   public NodeIdMap(String graphPath, long nbNodes) throws IOException {
     this.graphPath = graphPath;
     this.nbIds = nbNodes;
     this.swhToNodeMap = new MMapInputFile(graphPath + ".swhToNodeMap.csv", SWH_TO_NODE_LINE_LENGTH);
     this.nodeToSwhMap = new MMapInputFile(graphPath + ".nodeToSwhMap.csv", NODE_TO_SWH_LINE_LENGTH);
   }
 
   // SWH id (string) -> WebGraph node id (long)
   // Each line in .swhToNode.csv is formatted as: swhId nodeId
   // The file is sorted by swhId, hence we can binary search on swhId to get corresponding nodeId
   public long getNodeId(SwhId swhId) {
     long start = 0;
     long end = nbIds - 1;
 
     while (start <= end) {
       long lineNumber = (start + end) / 2L;
       String[] parts = swhToNodeMap.readAtLine(lineNumber).split(" ");
       if (parts.length != 2) {
         break;
       }
 
       String currentSwhId = parts[0];
       long currentNodeId = Long.parseLong(parts[1]);
 
       int cmp = currentSwhId.compareTo(swhId.toString());
       if (cmp == 0) {
         return currentNodeId;
       } else if (cmp < 0) {
         start = lineNumber + 1;
       } else {
         end = lineNumber - 1;
       }
     }
 
     throw new IllegalArgumentException("Unknown SWH id: " + swhId);
   }
 
   // WebGraph node id (long) -> SWH id (string)
   // Each line in .nodeToSwh.csv is formatted as: swhId
   // The file is ordered by nodeId, meaning node0's swhId is at line 0, hence we can read the
   // nodeId-th line to get corresponding swhId
   public SwhId getSwhId(long nodeId) {
     if (nodeId < 0 || nodeId >= nbIds) {
       throw new IllegalArgumentException("Node id " + nodeId + " should be between 0 and " + nbIds);
     }
 
     String swhId = nodeToSwhMap.readAtLine(nodeId);
     return new SwhId(swhId);
   }
 
   public void close() throws IOException {
     swhToNodeMap.close();
     nodeToSwhMap.close();
   }
 }