diff --git a/Foundation/include/Poco/Foundation.h b/Foundation/include/Poco/Foundation.h
index 092e6f376..760d1d88c 100644
--- a/Foundation/include/Poco/Foundation.h
+++ b/Foundation/include/Poco/Foundation.h
@@ -39,10 +39,10 @@
 
 
 //
-// The following block is the standard way of creating macros which make exporting 
+// The following block is the standard way of creating macros which make exporting
 // from a DLL simpler. All files within this DLL are compiled with the Foundation_EXPORTS
 // symbol defined on the command line. this symbol should not be defined on any project
-// that uses this DLL. This way any other project whose source files include this file see 
+// that uses this DLL. This way any other project whose source files include this file see
 // Foundation_API functions as being imported from a DLL, whereas this DLL sees symbols
 // defined with this macro as being exported.
 //
@@ -50,7 +50,7 @@
 	#if defined(Foundation_EXPORTS)
 		#define Foundation_API __declspec(dllexport)
 	#else
-		#define Foundation_API __declspec(dllimport)	
+		#define Foundation_API __declspec(dllimport)
 	#endif
 #endif
 
@@ -143,6 +143,23 @@
 #define POCO_DO_JOIN2(X, Y) X##Y
 
 
+//
+// POCO_DEPRECATED
+//
+// A macro expanding to a compiler-specific clause to
+// mark a class or function as deprecated.
+//
+#ifdef _GNUC_
+#define POCO_DEPRECATED __attribute__((deprecated))
+#elif defined(__clang__)
+#define POCO_DEPRECATED __attribute__((deprecated))
+#elif defined(_MSC_VER)
+#define POCO_DEPRECATED __declspec(deprecated)
+#else
+#define POCO_DEPRECATED
+#endif
+
+
 //
 // Pull in basic definitions
 //