diff --git a/core/plug-in/adpcm/CMakeLists.txt b/core/plug-in/adpcm/CMakeLists.txt
index 5055c03b..da3d024c 100644
--- a/core/plug-in/adpcm/CMakeLists.txt
+++ b/core/plug-in/adpcm/CMakeLists.txt
@@ -1,4 +1,5 @@
 set (adpcm_SRCS
+adpcm.c
 g711.c
 g721.c
 g723_16.c