diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 9a8b1cf4..035c89e6 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -4,6 +4,7 @@ lib_xua Change Log
 1.2.0
 -----
 
+  * ADDED:     Updates for xcore.ai/XS3 compatibility
   * ADDED:     Makefile.Win32 for xmosdfu on Windows
   * FIXED:     Bump default BCD device number to v1.2.0
   * FIXED:     xmosdfu now fails with an error when given a directory (#119)
diff --git a/lib_xua/src/core/mixer/fastmix.S b/lib_xua/src/core/mixer/fastmix.S
index ca4e39e1..0ab9c0ff 100644
--- a/lib_xua/src/core/mixer/fastmix.S
+++ b/lib_xua/src/core/mixer/fastmix.S
@@ -5,7 +5,7 @@
 #define MIX_INPUTS 18
 
 
-#if defined(__XS2A__)
+#if defined(__XS2A__) || defined(__XS3A__)
 
 #define DOMIX_TOP(i) \
 .cc_top doMix##i.function,doMix##i; \