diff --git a/tools/build/cross-build/include/linux/fcntl.h b/tools/build/cross-build/include/linux/fcntl.h
--- a/tools/build/cross-build/include/linux/fcntl.h
+++ b/tools/build/cross-build/include/linux/fcntl.h
@@ -44,3 +44,10 @@
 #include "__unused_workaround_end.h"
 
 #include <sys/file.h>
+
+/*
+ * On FreeBSD fcntl.h indirectly brings in cdefs.h. On Linux with musl, it does
+ * not. It's needed in our fcntl.h for the cross build since we use
+ * __BEGIN_DECLS and __END_DECLS from it there.
+ */
+#include <sys/cdefs.h>
diff --git a/tools/build/fcntl.h b/tools/build/fcntl.h
--- a/tools/build/fcntl.h
+++ b/tools/build/fcntl.h
@@ -29,13 +29,6 @@
 
 #include_next <fcntl.h>
 
-/*
- * On FreeBSD fcntl.h indirectly brings in cdefs.h. On Linux with musl, it does
- * not. Unconditionally inlude it here since there's no harm in including it
- * multiple times since we use __BEGIN_DECLS and __END_DECLS from it below.
- */
-#include <sys/cdefs.h>
-
 struct spacectl_range {
 	off_t	r_offset;
 	off_t	r_len;