1 files changed, 4 insertions, 0 deletions
diff --git a/src/net.cpp b/src/net.cpp
index cff4c54505..04119e9ddd 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -2410,6 +2410,10 @@ void CNode::AskFor(const CInv& inv)
 {
     if (mapAskFor.size() > MAPASKFOR_MAX_SZ)
         return;
+    // a peer may not occupy multiple positions in an inv's request queue
+    if (!setAskFor.insert(inv.hash).second)
+        return;
+
     // We're using mapAskFor as a priority queue,
     // the key is the earliest time the request can be sent
     int64_t nRequestTime;