diff --git a/Foundation/include/Poco/Platform.h b/Foundation/include/Poco/Platform.h
index def8f0733..c5bc0e0cf 100644
--- a/Foundation/include/Poco/Platform.h
+++ b/Foundation/include/Poco/Platform.h
@@ -166,7 +166,12 @@
 #elif defined(__PPC) || defined(__POWERPC__) || defined(__powerpc) || defined(__PPC__) || \
       defined(__powerpc__) || defined(__ppc__) || defined(__ppc) || defined(_ARCH_PPC) || defined(_M_PPC)
 	#define POCO_ARCH POCO_ARCH_PPC
-	#define POCO_ARCH_BIG_ENDIAN 1
+        #if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+                #define POCO_ARCH_LITTLE_ENDIAN 1
+        #else
+                #define POCO_ARCH_BIG_ENDIAN 1
+        #endif
+
 #elif defined(_POWER) || defined(_ARCH_PWR) || defined(_ARCH_PWR2) || defined(_ARCH_PWR3) || \
       defined(_ARCH_PWR4) || defined(__THW_RS6000)
 	#define POCO_ARCH POCO_ARCH_POWER