diff --git a/src/PommeTypes.h b/src/PommeTypes.h
index c8c864b..07f5199 100644
--- a/src/PommeTypes.h
+++ b/src/PommeTypes.h
@@ -19,7 +19,7 @@ typedef unsigned short                  UInt16;
 typedef unsigned int                    UInt32;
 typedef unsigned long long              UInt64;
 
-#if TARGET_RT_BIGENDIAN
+#if __BIG_ENDIAN__
 typedef struct { UInt32 hi, lo; } UnsignedWide;
 #else
 typedef struct { UInt32 lo, hi; } UnsignedWide;
@@ -283,7 +283,7 @@ typedef UInt8 KeyMapByteArray[16];
 //-----------------------------------------------------------------------------
 // 'vers' resource
 
-#if TARGET_RT_BIG_ENDIAN
+#if __BIG_ENDIAN__
 //BCD encoded, e.g. "4.2.1a3" is 0x04214003
 typedef struct NumVersion
 {
diff --git a/src/Utilities/bigendianstreams.h b/src/Utilities/bigendianstreams.h
index f5becf4..c6d7e4b 100644
--- a/src/Utilities/bigendianstreams.h
+++ b/src/Utilities/bigendianstreams.h
@@ -48,7 +48,7 @@ namespace Pomme
 		{
 			char b[sizeof(T)];
 			Read(b, sizeof(T));
-#if !(TARGET_RT_BIGENDIAN)
+#if !(__BIG_ENDIAN__)
 			if constexpr (sizeof(T) > 1)
 			{
 				std::reverse(b, b + sizeof(T));
@@ -80,7 +80,7 @@ namespace Pomme
 		void Write(T value)
 		{
 			char* b = (char*) &value;
-#if !(TARGET_RT_BIGENDIAN)
+#if !(__BIG_ENDIAN__)
 			if constexpr (sizeof(T) > 1)
 			{
 				std::reverse(b, b + sizeof(T));
diff --git a/src/Utilities/structpack.h b/src/Utilities/structpack.h
index 4b404f7..a53b755 100644
--- a/src/Utilities/structpack.h
+++ b/src/Utilities/structpack.h
@@ -8,7 +8,7 @@
 
 template<typename T> T ByteswapScalar(T x)
 {
-#if TARGET_RT_BIGENDIAN
+#if __BIG_ENDIAN__
 	return x;
 #else
 	char* b = (char*)&x;