diff --git a/CMakeLists.txt b/CMakeLists.txt
index af175d3..2a88af3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -285,6 +285,7 @@ add_library(liblzma
     src/liblzma/common/stream_buffer_decoder.c
     src/liblzma/common/stream_buffer_encoder.c
     src/liblzma/common/stream_decoder.c
+    src/liblzma/common/stream_decoder_mt.c
     src/liblzma/common/stream_decoder.h
     src/liblzma/common/stream_encoder.c
     src/liblzma/common/stream_encoder_mt.c