diff --git a/pkg/tcpip/transport/tcp/connect.go b/pkg/tcpip/transport/tcp/connect.go
index fe4bc56f5..f5f7be195 100644
--- a/pkg/tcpip/transport/tcp/connect.go
+++ b/pkg/tcpip/transport/tcp/connect.go
@@ -496,7 +496,9 @@ func (h *handshake) resolveRoute() *tcpip.Error {
 		}
 
 		// Wait for notification.
+		h.ep.mu.Unlock()
 		index, _ = s.Fetch(true /* block */)
+		h.ep.mu.Lock()
 	}
 }