diff --git a/Foundation/include/Poco/StreamUtil.h b/Foundation/include/Poco/StreamUtil.h
index 79c94f549..a77b0e630 100644
--- a/Foundation/include/Poco/StreamUtil.h
+++ b/Foundation/include/Poco/StreamUtil.h
@@ -55,11 +55,11 @@
 //
 // In this scenario, std::ios::init() is called twice
 // (the first time by the MyIOS constructor, the second
-// time by the std::istream constructor), resulting in 
-// two locale objects being allocated, the pointer second 
-// one overwriting the pointer to the first one and thus 
+// time by the std::istream constructor), resulting in
+// two locale objects being allocated, the pointer second
+// one overwriting the pointer to the first one and thus
 // causing a memory leak.
-// 
+//
 // The workaround is to call init() only once for each
 // stream object - by the istream, ostream or iostream
 // constructor, and not calling init() in ios-derived
@@ -77,6 +77,9 @@
 #		define POCO_IOS_INIT_HACK 1
     // QNX with Dinkumware but not GNU C++ Library
 #	elif defined(__QNX__) && !defined(__GLIBCPP__)
+#		define POCO_IOS_INIT_HACK 1
+	// Linux with Clang libc++
+#   elif defined(__linux) && defined(_LIBCPP_VERSION)
 #		define POCO_IOS_INIT_HACK 1
 #	endif
 #endif