diff --git a/Common/ChunkFile.h b/Common/ChunkFile.h
index b9ae0be8ae..095831678a 100644
--- a/Common/ChunkFile.h
+++ b/Common/ChunkFile.h
@@ -41,7 +41,7 @@
 #include "FileUtil.h"
 #include "../ext/snappy/snappy-c.h"
 
-#ifdef ANDROID
+#if defined(ANDROID) || defined(IOS)
 namespace std {
 	using tr1::is_pointer;
 }
diff --git a/Common/StdMutex.h b/Common/StdMutex.h
index e143f9bc95..cabebd51ab 100644
--- a/Common/StdMutex.h
+++ b/Common/StdMutex.h
@@ -5,24 +5,20 @@
 #define GCC_VER(x,y,z)	((x) * 10000 + (y) * 100 + (z))
 #define GCC_VERSION GCC_VER(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
 
-#if GCC_VERSION >= GCC_VER(4,4,0) && __GXX_EXPERIMENTAL_CXX0X__ && !defined(ANDROID) && !defined(__SYMBIAN32__) || defined(__APPLE__)
-// GCC 4.4 provides <mutex>
+#if (GCC_VERSION >= GCC_VER(4,4,0) && __GXX_EXPERIMENTAL_CXX0X__ || defined(__APPLE__)) \
+/* GCC 4.4 provides <mutex>, except on these platforms: */ \
+	&& !defined(ANDROID) && !defined(__SYMBIAN32__) && !defined(IOS)
 #include <mutex>
 #else
 
 // partial <mutex> implementation for win32/pthread
-
 #include <algorithm>
 
-#if defined(_WIN32)
-// WIN32
+#if defined(_WIN32) // WIN32
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
-
-#else
-// POSIX
+#else // POSIX
 #include <pthread.h>
-
 #endif
 
 #if (_MSC_VER >= 1600) || (GCC_VERSION >= GCC_VER(4,3,0) && __GXX_EXPERIMENTAL_CXX0X__)