diff --git a/wxdata/source/scwx/provider/aws_level2_data_provider.cpp b/wxdata/source/scwx/provider/aws_level2_data_provider.cpp
index b7afbf35..9e1718bf 100644
--- a/wxdata/source/scwx/provider/aws_level2_data_provider.cpp
+++ b/wxdata/source/scwx/provider/aws_level2_data_provider.cpp
@@ -85,6 +85,8 @@ AwsLevel2DataProvider::FindKey(std::chrono::system_clock::time_point time)
 
    std::string key {};
 
+   std::shared_lock lock(p->objectsMutex_);
+
    std::optional<std::string> element =
       util::GetBoundedElement(p->objects_, time);