diff --git a/NetSSL_Win/include/Poco/Net/AutoSecBufferDesc.h b/NetSSL_Win/include/Poco/Net/AutoSecBufferDesc.h
index a6aea8935..f9f6b330d 100644
--- a/NetSSL_Win/include/Poco/Net/AutoSecBufferDesc.h
+++ b/NetSSL_Win/include/Poco/Net/AutoSecBufferDesc.h
@@ -19,12 +19,14 @@
 
 
 #include "Poco/Net/NetSSL.h"
+#if defined(POCO_OS_FAMILY_WINDOWS)
 #include <windows.h>
 #include <wincrypt.h>
 #ifndef SECURITY_WIN32
 #define SECURITY_WIN32
-#endif
 #include <sspi.h>
+#endif
+#endif
 
 
 namespace Poco {
diff --git a/NetSSL_Win/include/Poco/Net/Context.h b/NetSSL_Win/include/Poco/Net/Context.h
index 090a0cf7c..7d2d190bd 100644
--- a/NetSSL_Win/include/Poco/Net/Context.h
+++ b/NetSSL_Win/include/Poco/Net/Context.h
@@ -24,6 +24,7 @@
 #include "Poco/AutoPtr.h"
 #include "Poco/Mutex.h"
 #include <vector>
+#if defined(POCO_OS_FAMILY_WINDOWS)
 #include <windows.h>
 #include <wincrypt.h>
 #include <schannel.h>
@@ -32,6 +33,7 @@
 #endif
 #include <security.h>
 #include <sspi.h>
+#endif
 
 
 namespace Poco {
diff --git a/NetSSL_Win/include/Poco/Net/SSLManager.h b/NetSSL_Win/include/Poco/Net/SSLManager.h
index e2e063ff7..db5d9b0a7 100644
--- a/NetSSL_Win/include/Poco/Net/SSLManager.h
+++ b/NetSSL_Win/include/Poco/Net/SSLManager.h
@@ -27,6 +27,7 @@
 #include "Poco/Util/AbstractConfiguration.h"
 #include "Poco/BasicEvent.h"
 #include "Poco/SharedPtr.h"
+#if defined(POCO_OS_FAMILY_WINDOWS)
 #include <wincrypt.h>
 #include <schannel.h>
 #ifndef SECURITY_WIN32
@@ -34,6 +35,7 @@
 #endif
 #include <security.h>
 #include <sspi.h>
+#endif
 
 
 namespace Poco {
diff --git a/NetSSL_Win/include/Poco/Net/X509Certificate.h b/NetSSL_Win/include/Poco/Net/X509Certificate.h
index 99fffe805..42e317889 100644
--- a/NetSSL_Win/include/Poco/Net/X509Certificate.h
+++ b/NetSSL_Win/include/Poco/Net/X509Certificate.h
@@ -22,7 +22,9 @@
 #include "Poco/DateTime.h"
 #include <set>
 #include <istream>
+#if defined(POCO_OS_FAMILY_WINDOWS)
 #include <wincrypt.h>
+#endif
 
 
 namespace Poco {