1 files changed, 1 insertions, 0 deletions
diff --git a/src/encryption/Olm.cpp b/src/encryption/Olm.cpp
index 0004a40c..38b38476 100644
--- a/src/encryption/Olm.cpp
+++ b/src/encryption/Olm.cpp
@@ -1220,6 +1220,7 @@ send_encrypted_to_device_messages(const std::map<std::string, std::vector<std::s
         auto deviceTargets = devices;
         if (devices.empty()) {
             deviceTargets.clear();
+            deviceTargets.reserve(deviceKeys->device_keys.size());
             for (const auto &[device, keys] : deviceKeys->device_keys) {
                 (void)keys;
                 deviceTargets.push_back(device);