diff --git a/python/tools/scanner.py b/python/tools/scanner.py
index 2864741cb03298f6fe4ec94e5af04fa13994de61..43ea753b4c9fc4b964fa0244c618b8bb855ebc06 100755
--- a/python/tools/scanner.py
+++ b/python/tools/scanner.py
@@ -175,7 +175,7 @@ def generate_set():
         if addr[0] == '[':
             addr = addr[1:-1]
             if addr in node_ipv6:
-                node_ipv6[addr][1] = 1
+                node_ipv6[addr][1] += 1
             else:
                 node_ipv6[addr] = [n, 1]
         else: