diff --git a/lib_util/tinywavein_c.h b/lib_util/tinywavein_c.h
index 6e0e69beb978d509b37c96a68d5bb47b09e90d8b..eafac53d96fb97436b6802d743e4c5cecaffb699 100644
--- a/lib_util/tinywavein_c.h
+++ b/lib_util/tinywavein_c.h
@@ -38,7 +38,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#if defined( __i386__ ) || defined( _M_IX86 ) || defined( __x86_64__ ) || defined( _M_X64 ) || defined( __arm__ ) || defined( __aarch64__ ) || ( defined( __BYTE_ORDER__ ) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ )
+#if defined( __i386__ ) || defined( _M_IX86 ) || defined( __x86_64__ ) || defined( _M_X64 ) || defined( __arm__ ) || defined( __aarch64__ ) || defined( _M_ARM ) || defined( _M_ARM64 ) || ( defined( __BYTE_ORDER__ ) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ )
 #define __TWI_LE /* _T_iny _W_ave _I_n _L_ittle _E_ndian */
 #endif
 
diff --git a/lib_util/tinywaveout_c.h b/lib_util/tinywaveout_c.h
index 7dee32745021bbb3793115677ab87014067bf586..c82113538ae6d9b378c374aa8789ebf6c04ecaad 100644
--- a/lib_util/tinywaveout_c.h
+++ b/lib_util/tinywaveout_c.h
@@ -37,7 +37,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#if defined( __i386__ ) || defined( _M_IX86 ) || defined( _M_X64 ) || defined( __x86_64__ ) || defined( __arm__ ) || defined( __aarch64__ ) || ( defined( __BYTE_ORDER__ ) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ )
+#if defined( __i386__ ) || defined( _M_IX86 ) || defined( _M_X64 ) || defined( __x86_64__ ) || defined( __arm__ ) || defined( __aarch64__ ) || defined( _M_ARM ) || defined( _M_ARM64 ) || ( defined( __BYTE_ORDER__ ) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ )
 #define __TWO_LE /* _T_iny _W_ave _O_ut _L_ittle _E_ndian */
 #endif
 
@@ -47,7 +47,7 @@
 
 #if !defined( __TWO_LE ) && !defined( __TWO_BE )
 #pragma message( "unknown processor - assuming Little Endian" )
-#define __TWI_LE
+#define __TWO_LE
 #endif
 
 #define __TWO_SUCCESS ( 0 )