diff --git a/c/src/exec/score/cpu/unix/cpu.c b/c/src/exec/score/cpu/unix/cpu.c
index 248ef4cc93..ee3dc8484d 100644
--- a/c/src/exec/score/cpu/unix/cpu.c
+++ b/c/src/exec/score/cpu/unix/cpu.c
@@ -282,7 +282,7 @@ void _CPU_Initialize(
    *  we are in trouble.
    */
 
-  if ( sizeof(Context_Control_overlay) < sizeof(Context_Control) )
+  if ( sizeof(Context_Control_overlay) > sizeof(Context_Control) )
     _CPU_Fatal_error(0x100 + 1);
 
   /*