diff --git a/tools/llvm-rust-demangle-fuzzer/llvm-rust-demangle-fuzzer.cpp b/tools/llvm-rust-demangle-fuzzer/llvm-rust-demangle-fuzzer.cpp
index 0e8f5979c6d..c2891e532e2 100644
--- a/tools/llvm-rust-demangle-fuzzer/llvm-rust-demangle-fuzzer.cpp
+++ b/tools/llvm-rust-demangle-fuzzer/llvm-rust-demangle-fuzzer.cpp
@@ -7,9 +7,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Demangle/Demangle.h"
-
 #include <cstdint>
 #include <cstdlib>
+#include <string>
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
   std::string NullTerminatedString((const char *)Data, Size);