diff --git a/external/st_audiofile/src/st_audiofile.c b/external/st_audiofile/src/st_audiofile.c
index 452a1bee..1abc51da 100644
--- a/external/st_audiofile/src/st_audiofile.c
+++ b/external/st_audiofile/src/st_audiofile.c
@@ -9,6 +9,8 @@
 #include "st_audiofile_libs.h"
 #include <stdlib.h>
 
+#define WAVPACK_MEMORY_ASSUMED_VERSION 5
+
 struct st_audio_file {
     int type;
     union {
diff --git a/external/st_audiofile/src/st_audiofile.h b/external/st_audiofile/src/st_audiofile.h
index 6822cd0e..787cc332 100644
--- a/external/st_audiofile/src/st_audiofile.h
+++ b/external/st_audiofile/src/st_audiofile.h
@@ -19,8 +19,6 @@
 #include <wchar.h>
 #endif
 
-#define WAVPACK_MEMORY_ASSUMED_VERSION 5
-
 #ifdef __cplusplus
 extern "C" {
 #endif