diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 6dc30a3..2d7adf4 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -42,6 +42,7 @@
     decoding/GSM610Tables.cpp
     decoding/GSM660Tables.cpp
     decoding/GSM690Tables.cpp
+    decoding/ViterbiR204.cpp
     misc_utils/controlled_rotator_cc_impl.cc
     misc_utils/controlled_const_source_f_impl.cc
     misc_utils/message_printer_impl.cc