--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -49,8 +49,6 @@
 
 add_subdirectory(accidental-noise)
 
-ADD_SUBDIRECTORY(lz4)
-
 ADD_SUBDIRECTORY(imgui)
 
 if(FSO_BUILD_WITH_OPENXR)