diff --git a/fuzzing/fuzz_TestSpecParser.cpp b/fuzzing/fuzz_TestSpecParser.cpp
index 3aba8c84..6c20dbbf 100644
--- a/fuzzing/fuzz_TestSpecParser.cpp
+++ b/fuzzing/fuzz_TestSpecParser.cpp
@@ -9,6 +9,7 @@
 
 #include <catch2/internal/catch_test_spec_parser.hpp>
 #include <catch2/internal/catch_tag_alias_registry.hpp>
+#include <cstdint>
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
 
diff --git a/fuzzing/fuzz_textflow.cpp b/fuzzing/fuzz_textflow.cpp
index 7000f420..f3119379 100644
--- a/fuzzing/fuzz_textflow.cpp
+++ b/fuzzing/fuzz_textflow.cpp
@@ -13,6 +13,7 @@
 
 #include <string>
 #include <string_view>
+#include <cstdint>
 
 
 template<class Callback>