diff --git a/c/src/exec/score/cpu/unix/cpu.h b/c/src/exec/score/cpu/unix/cpu.h
index 9e616620ac..2e69d4af2e 100644
--- a/c/src/exec/score/cpu/unix/cpu.h
+++ b/c/src/exec/score/cpu/unix/cpu.h
@@ -26,7 +26,7 @@
 extern "C" {
 #endif
 
-#include <rtems/score/unix.h>
+#include <rtems/score/unix.h>              /* pick up machine definitions */
 #ifndef ASM
 #include <rtems/score/unixtypes.h>
 #endif