diff --git a/Source/kwsys/CPU.h.in b/Source/kwsys/CPU.h.in
index 884d71a..66ffbb1 100644
--- a/Source/kwsys/CPU.h.in
+++ b/Source/kwsys/CPU.h.in
@@ -88,6 +88,10 @@
 #elif defined(__mips) || defined(__mips__) || defined(__MIPS__)
 # define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
 
+/* NIOS2 */
+#elif defined(__NIOS2__) || defined(__NIOS2) || defined(__nios2__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+
 /* OpenRISC 1000 */
 #elif defined(__or1k__)
 # define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
diff --git a/Utilities/KWIML/ABI.h.in b/Utilities/KWIML/ABI.h.in
index 6300ada..87b6e96 100644
--- a/Utilities/KWIML/ABI.h.in
+++ b/Utilities/KWIML/ABI.h.in
@@ -398,6 +398,10 @@
 #elif defined(__mips) || defined(__mips__) || defined(__MIPS__)
 # define @KWIML@_ABI_ENDIAN_ID @KWIML@_ABI_ENDIAN_ID_BIG
 
+/* NIOS2 */
+#elif defined(__NIOS2__) || defined(__NIOS2) || defined(__nios2__)
+# define @KWIML@_ABI_ENDIAN_ID @KWIML@_ABI_ENDIAN_ID_LITTLE
+
 /* OpenRISC 1000 */
 #elif defined(__or1k__)
 # define @KWIML@_ABI_ENDIAN_ID @KWIML@_ABI_ENDIAN_ID_BIG