diff --git a/include/asm-x86_64/setup.h b/include/asm-x86_64/setup.h
index 985d4e3c79da..eaeff73d6c10 100644
--- a/include/asm-x86_64/setup.h
+++ b/include/asm-x86_64/setup.h
@@ -1,6 +1,6 @@
 #ifndef _x8664_SETUP_H
 #define _x8664_SETUP_H
 
-#define COMMAND_LINE_SIZE	256
+#define COMMAND_LINE_SIZE	2048
 
 #endif