diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index c8181392f70d7d19b8f806c667ea8770a1090664..726e264410ffc9ff7e8593bf94e53c73381beb9a 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -59,7 +59,7 @@ void __puthex(unsigned long value);
 
 static inline void debug_putstr(const char *s)
 { }
-static inline void debug_puthex(const char *s)
+static inline void debug_puthex(unsigned long value)
 { }
 #define debug_putaddr(x) /* */