diff --git a/src/header/semaphore/cbindgen.toml b/src/header/semaphore/cbindgen.toml
index be8f845c58..c0024ed9ea 100644
--- a/src/header/semaphore/cbindgen.toml
+++ b/src/header/semaphore/cbindgen.toml
@@ -1,4 +1,8 @@
-sys_includes = []
+# TODO clean up namespace pollution from fcntl later
+#
+# fcntl.h brings in O_CREAT and O_EXCL
+# fcntl.h brings in sys/stat.h which brings in sys/types.h which brings in clockid_t (needed for sem_clockwait)
+sys_includes = ["fcntl.h"]
 include_guard = "_RELIBC_SEMAPHORE_H"
 after_includes = """
 #include <bits/timespec.h> // for timespec