diff --git a/compiler-rt/test/fuzzer/CounterTest.cpp b/compiler-rt/test/fuzzer/CounterTest.cpp
--- a/compiler-rt/test/fuzzer/CounterTest.cpp
+++ b/compiler-rt/test/fuzzer/CounterTest.cpp
@@ -4,6 +4,7 @@
 
 // Test for a fuzzer: must find the case where a particular basic block is
 // executed many times.
+#include <cstdint>
 #include <iostream>
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
diff --git a/compiler-rt/test/fuzzer/FlagsTest.cpp b/compiler-rt/test/fuzzer/FlagsTest.cpp
--- a/compiler-rt/test/fuzzer/FlagsTest.cpp
+++ b/compiler-rt/test/fuzzer/FlagsTest.cpp
@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 // Parse some flags
+#include <cstdint>
 #include <string>
 #include <vector>