diff --git a/src/side_chain.cpp b/src/side_chain.cpp
index ecd0e89..6cc81b3 100644
--- a/src/side_chain.cpp
+++ b/src/side_chain.cpp
@@ -498,10 +498,10 @@ void SideChain::cleanup_incoming_blocks()
 
 	MutexLock lock(m_incomingBlocksLock);
 
-	// Forget seen blocks that were added more than a minute ago
+	// Forget seen blocks that were added more than 10 minutes ago
 	hash h;
 	for (auto i = m_incomingBlocks.begin(); i != m_incomingBlocks.end();) {
-		if (cur_time < i->second + 60) {
+		if (cur_time < i->second + 10 * 60) {
 			++i;
 		}
 		else {