diff --git a/libultraship/libultraship/CMakeLists.txt b/libultraship/libultraship/CMakeLists.txt
index d2b35a1f8..6d3716216 100644
--- a/libultraship/libultraship/CMakeLists.txt
+++ b/libultraship/libultraship/CMakeLists.txt
@@ -66,7 +66,9 @@ set(Source_Files__Audio__extra
     "WasapiAudioPlayer.cpp"
     "WasapiAudioPlayer.h"
 )
-else()
+endif ()
+
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
 set(Source_Files__Audio__extra
     "PulseAudioPlayer.cpp"
     "PulseAudioPlayer.h"