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-rw-r--r--test/cpp/interop/interop_test.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/cpp/interop/interop_test.cc b/test/cpp/interop/interop_test.cc
index a7a5cc0b2c..aac6e56b89 100644
--- a/test/cpp/interop/interop_test.cc
+++ b/test/cpp/interop/interop_test.cc
@@ -52,6 +52,7 @@ extern "C" {
#include <grpc/support/alloc.h>
#include <grpc/support/host_port.h>
#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
#include "test/core/util/port.h"
int test_client(const char* root, const char* host, int port) {