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-rw-r--r--clang-tools-extra/clang-tidy/cppcoreguidelines/MacroUsageCheck.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang-tools-extra/clang-tidy/cppcoreguidelines/MacroUsageCheck.cpp b/clang-tools-extra/clang-tidy/cppcoreguidelines/MacroUsageCheck.cpp
index 5791fd0bf1d..47f563ba6ef 100644
--- a/clang-tools-extra/clang-tidy/cppcoreguidelines/MacroUsageCheck.cpp
+++ b/clang-tools-extra/clang-tidy/cppcoreguidelines/MacroUsageCheck.cpp
@@ -13,6 +13,7 @@
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Regex.h"
#include <algorithm>
+#include <cctype>
namespace clang {
namespace tidy {
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