diff --git a/src/MatcherBase.h b/src/MatcherBase.h
index abff96f..f86e6ba 100644
--- a/src/MatcherBase.h
+++ b/src/MatcherBase.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <memory>
 #include <string>
 #include <unordered_map>