diff --git a/test/extensions/geoip_providers/maxmind/geoip_provider_test.cc b/test/extensions/geoip_providers/maxmind/geoip_provider_test.cc
index 6d3e8961d82a..14bb46184314 100644
--- a/test/extensions/geoip_providers/maxmind/geoip_provider_test.cc
+++ b/test/extensions/geoip_providers/maxmind/geoip_provider_test.cc
@@ -94,7 +94,6 @@ class GeoipProviderTestBase {
         Registry::FactoryRegistry<Geolocation::GeoipProviderFactory>::getFactory(
             "envoy.geoip_providers.maxmind"));
     ASSERT(provider_factory_);
-    on_changed_cbs_.reserve(1);
   }
 
   ~GeoipProviderTestBase() {
@@ -116,6 +115,7 @@ class GeoipProviderTestBase {
                                                           Filesystem::Watcher::OnChangedCb cb) {
                 {
                   absl::WriterMutexLock lock(&mutex_);
+                  on_changed_cbs_.reserve(1);
                   on_changed_cbs_.emplace_back(std::move(cb));
                 }
                 if (conditional.has_value()) {