diff --git a/Util/include/Poco/Util/Application.h b/Util/include/Poco/Util/Application.h
index 8f656e71e..135972796 100644
--- a/Util/include/Poco/Util/Application.h
+++ b/Util/include/Poco/Util/Application.h
@@ -139,7 +139,7 @@ public:
 		/// Note that as of release 1.3.7, init() no longer
 		/// calls initialize(). This is now called from run().
 
-#if !defined(POCO_NO_WSTRING)
+#if defined (POCO_OS_FAMILY_WINDOWS) && !defined(POCO_NO_WSTRING)
 	void init(int argc, wchar_t* argv[]);
 		/// Processes the application's command line arguments
 		/// and sets the application's properties (e.g.,
diff --git a/Util/src/Application.cpp b/Util/src/Application.cpp
index 0bda8e1e9..bba03574f 100644
--- a/Util/src/Application.cpp
+++ b/Util/src/Application.cpp
@@ -134,7 +134,7 @@ void Application::init(int argc, char* pArgv[])
 }
 
 
-#if !defined(POCO_NO_WSTRING)
+#if defined (POCO_OS_FAMILY_WINDOWS) && !defined(POCO_NO_WSTRING)
 void Application::init(int argc, wchar_t* argv[])
 {
 	std::vector<std::string> args;