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-rw-r--r--src/cpp/util/string_ref.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/cpp/util/string_ref.cc b/src/cpp/util/string_ref.cc
index 9adc092013..c42033f61f 100644
--- a/src/cpp/util/string_ref.cc
+++ b/src/cpp/util/string_ref.cc
@@ -36,6 +36,7 @@
#include <string.h>
#include <algorithm>
+#include <iostream>
namespace grpc {