diff --git a/src/processor/stackwalker_amd64_unittest.cc b/src/processor/stackwalker_amd64_unittest.cc
index 70fba11..efcd812 100644
--- a/src/processor/stackwalker_amd64_unittest.cc
+++ b/src/processor/stackwalker_amd64_unittest.cc
@@ -62,6 +62,7 @@
 using std::vector;
 using testing::_;
 using testing::AnyNumber;
+using testing::DoAll;
 using testing::Return;
 using testing::SetArgumentPointee;
 using testing::Test;
diff --git a/src/processor/stackwalker_arm64_unittest.cc b/src/processor/stackwalker_arm64_unittest.cc
index f9d18ce..d86fa12 100644
--- a/src/processor/stackwalker_arm64_unittest.cc
+++ b/src/processor/stackwalker_arm64_unittest.cc
@@ -64,6 +64,7 @@
 using std::vector;
 using testing::_;
 using testing::AnyNumber;
+using testing::DoAll;
 using testing::Return;
 using testing::SetArgumentPointee;
 using testing::Test;
diff --git a/src/processor/stackwalker_arm_unittest.cc b/src/processor/stackwalker_arm_unittest.cc
index 2ca7a02..256f764 100644
--- a/src/processor/stackwalker_arm_unittest.cc
+++ b/src/processor/stackwalker_arm_unittest.cc
@@ -64,6 +64,7 @@
 using std::vector;
 using testing::_;
 using testing::AnyNumber;
+using testing::DoAll;
 using testing::Return;
 using testing::SetArgumentPointee;
 using testing::Test;
diff --git a/src/processor/stackwalker_x86_unittest.cc b/src/processor/stackwalker_x86_unittest.cc
index 6685b45..359f1c8 100644
--- a/src/processor/stackwalker_x86_unittest.cc
+++ b/src/processor/stackwalker_x86_unittest.cc
@@ -63,6 +63,7 @@
 using std::vector;
 using testing::_;
 using testing::AnyNumber;
+using testing::DoAll;
 using testing::Return;
 using testing::SetArgumentPointee;
 using testing::Test;