diff --git a/arch/x86/kernel/gencore.c b/arch/x86/kernel/gencore.c
index a0c3edde..a2009346 100644
--- a/arch/x86/kernel/gencore.c
+++ b/arch/x86/kernel/gencore.c
@@ -64,7 +64,7 @@ int gencore(struct process *proc, void *regs,
 
 #define DUMMY
 
-#ifdef DUMMY
+#ifndef DUMMY
 
 	/* ELF header */