diff --git a/src/google/protobuf/io/printer.h b/src/google/protobuf/io/printer.h
index c56ca89d20..07924fe67c 100644
--- a/src/google/protobuf/io/printer.h
+++ b/src/google/protobuf/io/printer.h
@@ -27,6 +27,7 @@
 #include "absl/functional/function_ref.h"
 #include "absl/log/absl_check.h"
 #include "absl/meta/type_traits.h"
+#include "absl/strings/str_cat.h"
 #include "absl/strings/str_format.h"
 #include "absl/strings/string_view.h"
 #include "absl/types/optional.h"