diff --git a/Foundation/src/Environment_WIN32.cpp b/Foundation/src/Environment_WIN32.cpp
index 7c96a8da9..b0584eb49 100644
--- a/Foundation/src/Environment_WIN32.cpp
+++ b/Foundation/src/Environment_WIN32.cpp
@@ -19,6 +19,8 @@
 #include <sstream>
 #include <cstring>
 #include "Poco/UnWindows.h"
+#include <winsock2.h>
+#include <wincrypt.h>
 #include <iphlpapi.h>
 
 
diff --git a/Foundation/src/Environment_WIN32U.cpp b/Foundation/src/Environment_WIN32U.cpp
index c82699ad5..65fed1e62 100644
--- a/Foundation/src/Environment_WIN32U.cpp
+++ b/Foundation/src/Environment_WIN32U.cpp
@@ -21,6 +21,8 @@
 #include <sstream>
 #include <cstring>
 #include "Poco/UnWindows.h"
+#include <winsock2.h>
+#include <wincrypt.h>
 #include <iphlpapi.h>
 
 
diff --git a/Net/src/NetworkInterface.cpp b/Net/src/NetworkInterface.cpp
index bc5221340..e8140afec 100644
--- a/Net/src/NetworkInterface.cpp
+++ b/Net/src/NetworkInterface.cpp
@@ -30,6 +30,7 @@
 		#include "Poco/UnicodeConverter.h"
 	#endif
 	#include "Poco/Error.h"
+	#include <wincrypt.h>
 	#include <iphlpapi.h>
 	#include <ipifcons.h>
 #endif
@@ -37,7 +38,6 @@
 #include <iostream>
 #include <iomanip>
 
-
 using Poco::NumberFormatter;
 using Poco::FastMutex;
 using Poco::format;