diff --git a/cpp/purify/config.in.h b/cpp/purify/config.in.h
index 66d815518..32d3760e3 100644
--- a/cpp/purify/config.in.h
+++ b/cpp/purify/config.in.h
@@ -30,6 +30,7 @@
 
 #include <string>
 #include <tuple>
+#include <cstdint>
 
 namespace purify {
 //! Returns library version