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-rw-r--r--unittests/AST/ExternalASTSourceTest.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/unittests/AST/ExternalASTSourceTest.cpp b/unittests/AST/ExternalASTSourceTest.cpp
index 4f42dcf10336..4b3bb3e2b69b 100644
--- a/unittests/AST/ExternalASTSourceTest.cpp
+++ b/unittests/AST/ExternalASTSourceTest.cpp
@@ -17,6 +17,7 @@
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendActions.h"
+#include "clang/Lex/PreprocessorOptions.h"
#include "gtest/gtest.h"
using namespace clang;