diff --git a/clang-tools-extra/clangd/support/ThreadCrashReporter.cpp b/clang-tools-extra/clangd/support/ThreadCrashReporter.cpp
index e67900e6916d9..b0386ba0089d0 100644
--- a/clang-tools-extra/clangd/support/ThreadCrashReporter.cpp
+++ b/clang-tools-extra/clangd/support/ThreadCrashReporter.cpp
@@ -9,6 +9,7 @@
 #include "support/ThreadCrashReporter.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/ThreadLocal.h"
+#include <atomic>
 
 namespace clang {
 namespace clangd {