diff --git a/include/JSystem/JAudio2/JASTrack.h b/include/JSystem/JAudio2/JASTrack.h
index f55e20c964f..b749e874716 100644
--- a/include/JSystem/JAudio2/JASTrack.h
+++ b/include/JSystem/JAudio2/JASTrack.h
@@ -181,6 +181,19 @@ struct JASTrack : public JASPoolAllocObject_MultiThreaded<JASTrack> {
     /* 0x000 */ JASSeqCtrl mSeqCtrl;
     /* 0x05C */ JASTrackPort mTrackPort;
     /* 0x080 */ JASRegisterParam mRegisterParam;
+#ifdef __MWERKS__
+    /* 0x09C */ union {
+        struct {
+            MoveParam_ volume;
+            MoveParam_ pitch;
+            MoveParam_ fxmix;
+            MoveParam_ pan;
+            MoveParam_ dolby;
+            MoveParam_ distFilter;
+        } params;
+        MoveParam_ array[6];
+    } mMoveParam;
+#else
     /* 0x09C */ union MoveParam_u {
         struct {
             MoveParam_ volume;
@@ -193,6 +206,7 @@ struct JASTrack : public JASPoolAllocObject_MultiThreaded<JASTrack> {
         MoveParam_ array[6];
         MoveParam_u() {}
     } mMoveParam;
+#endif
     /* 0x0e4 */ JASOscillator::Data mOscParam[2];
     /* 0x114 */ JASOscillator::Point mOscPoint[4];
     /* 0x12C */ JASTrack* mParent;