diff --git a/ext/CMakeLists.txt b/ext/CMakeLists.txt
index 8205fe4054..e2b0f44a80 100644
--- a/ext/CMakeLists.txt
+++ b/ext/CMakeLists.txt
@@ -22,7 +22,7 @@ endif()
 
 # This works around a bug in cpu_features when ${CMAKE_BINARY_DIR} != ${CMAKE_CURRENT_BINRARY_DIR}.
 # We also disable the list_cpu_features binary.
-add_subdirectory(cmake/cpu_features)
+add_subdirectory(cmake/cpu_features EXCLUDE_FROM_ALL)
 
 set(SKIP_GLSLANG_INSTALL ON CACHE BOOL "" FORCE)
 set(ENABLE_GLSLANG_INSTALL OFF)