diff --git "a/cmake/headers.cmake" "b/cmake/headers.cmake"
index 108038d16..bf4807e16 100644
--- "a/cmake/headers.cmake"
+++ "b/cmake/headers.cmake"
@@ -47,7 +47,6 @@ set(outcome_HEADERS
   "include/outcome/experimental/status-code/include/system_code_from_exception.hpp"
   "include/outcome/experimental/status-code/include/system_error2.hpp"
   "include/outcome/experimental/status-code/include/win32_code.hpp"
-  "include/outcome/experimental/status-code/single-header/system_error2.hpp"
   "include/outcome/experimental/status_outcome.hpp"
   "include/outcome/experimental/status_result.hpp"
   "include/outcome/iostream_support.hpp"