diff --git a/src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.cc b/src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.cc
index dde7570ede..43e06d7a69 100644
--- a/src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.cc
+++ b/src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.cc
@@ -32,6 +32,7 @@
 #include "absl/strings/string_view.h"
 #include "absl/strings/strip.h"
 #include "absl/types/optional.h"
+#include "absl/strings/str_cat.h"
 
 #include <grpc/impl/channel_arg_names.h>
 #include <grpc/support/alloc.h>
diff --git a/src/core/lib/event_engine/cf_engine/cfstream_endpoint.cc b/src/core/lib/event_engine/cf_engine/cfstream_endpoint.cc
index 74f7392af9..656cdc427b 100644
--- a/src/core/lib/event_engine/cf_engine/cfstream_endpoint.cc
+++ b/src/core/lib/event_engine/cf_engine/cfstream_endpoint.cc
@@ -21,6 +21,7 @@
 #include "src/core/lib/event_engine/cf_engine/cfstream_endpoint.h"
 #include "src/core/lib/event_engine/trace.h"
 #include "src/core/lib/gprpp/strerror.h"
+#include "absl/strings/str_cat.h"
 
 namespace grpc_event_engine {
 namespace experimental {
diff --git a/src/core/lib/gprpp/windows/directory_reader.cc b/src/core/lib/gprpp/windows/directory_reader.cc
index 790e213e78..103d68a5a3 100644
--- a/src/core/lib/gprpp/windows/directory_reader.cc
+++ b/src/core/lib/gprpp/windows/directory_reader.cc
@@ -28,6 +28,7 @@
 
 #include "absl/status/statusor.h"
 #include "absl/strings/string_view.h"
+#include "absl/strings/str_cat.h"
 
 #include <grpc/support/log.h>