diff --git a/oaep.cpp b/oaep.cpp
index 93a535fc..2caa5441 100644
--- a/oaep.cpp
+++ b/oaep.cpp
@@ -4,6 +4,7 @@
 
 #ifndef CRYPTOPP_IMPORTS
 
+#include "cryptlib.h"
 #include "oaep.h"
 #include <functional>
 
diff --git a/zinflate.cpp b/zinflate.cpp
index 4b6e3bea..5ba63252 100644
--- a/zinflate.cpp
+++ b/zinflate.cpp
@@ -6,6 +6,7 @@
 // (http://www.kb.cert.org/vuls/id/368819).
 
 #include "pch.h"
+#include "cryptlib.h"
 #include "zinflate.h"
 #include "trap.h"