diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index cfd970d6d..5692acad4 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -684,6 +684,7 @@ file( GLOB HEADER_FILES
 	sound/midisources/*.h
 	sound/oplsynth/*.h
 	sound/oplsynth/dosbox/*.h
+	sound/thirdparty/*.h
 	sound/timidity/*.h
 	sound/timiditypp/*.h
 	sound/wildmidi/*.h
@@ -1377,6 +1378,7 @@ source_group("Audio Files\\WildMidi" REGULAR_EXPRESSION "^${CMAKE_CURRENT_SOURCE
 source_group("Audio Files\\MIDI Devices" REGULAR_EXPRESSION "^${CMAKE_CURRENT_SOURCE_DIR}/sound/mididevices/.+")
 source_group("Audio Files\\MIDI Sources" REGULAR_EXPRESSION "^${CMAKE_CURRENT_SOURCE_DIR}/sound/midisources/.+")
 source_group("Audio Files\\Music formats" REGULAR_EXPRESSION "^${CMAKE_CURRENT_SOURCE_DIR}/sound/musicformats/.+")
+source_group("Audio Files\\Third-party" REGULAR_EXPRESSION "^${CMAKE_CURRENT_SOURCE_DIR}/sound/thirdparty/.+")
 source_group("External\\Math" REGULAR_EXPRESSION "^${CMAKE_CURRENT_SOURCE_DIR}/math/.+")
 source_group("External\\RapidJSON" REGULAR_EXPRESSION "^${CMAKE_CURRENT_SOURCE_DIR}/rapidjson/.+")
 source_group("External\\SFMT" REGULAR_EXPRESSION "^${CMAKE_CURRENT_SOURCE_DIR}/sfmt/.+")