diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index 8fefee0f8..a22eb9f11 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -47,6 +47,15 @@ if (NOT TARGET FFmpeg::ffmpeg)
     add_library(FFmpeg::ffmpeg ALIAS ffmpeg)
 endif()
 
+# LibAtrac9
+
+file(GLOB LIBATRAC9_SOURCES
+    LibAtrac9/C/src/*.c
+)
+
+add_library(LibAtrac9 STATIC ${LIBATRAC9_SOURCES})
+target_include_directories(LibAtrac9 INTERFACE LibAtrac9/C/src)
+
 # Zlib-Ng
 if (NOT TARGET zlib-ng::zlib)
     set(ZLIB_ENABLE_TESTS OFF)