diff --git a/desmume/src/frontend/posix/meson.build b/desmume/src/frontend/posix/meson.build
index c1f3dbb78..a42c64d47 100644
--- a/desmume/src/frontend/posix/meson.build
+++ b/desmume/src/frontend/posix/meson.build
@@ -194,6 +194,7 @@ endif
 
 if dep_soundtouch.found()
   dependencies += dep_soundtouch
+  add_global_arguments('-DHAVE_LIBSOUNDTOUCH', language: ['c', 'cpp'])
   libdesmume_src += [
     '../../metaspu/SndOut.cpp',
     '../../metaspu/Timestretcher.cpp',