diff --git a/src/common/assertion.c b/src/common/assertion.c
index 8d93be430..d854c95f1 100644
--- a/src/common/assertion.c
+++ b/src/common/assertion.c
@@ -34,6 +34,7 @@
 
 
 #include "assertion.h"
+#include "attrib.h"
 
 
 
@@ -43,7 +44,7 @@
 
 
 
-int AssertAtLinkTime (AssertAction A)
+int AssertAtLinkTime (AssertAction A attribute ((unused)))
 /* Return true if this assertion should be evaluated at link time */
 {
     /* Currently all assertions are evaluated at link time */
@@ -54,7 +55,7 @@ int AssertAtLinkTime (AssertAction A)
 
 int AssertAtAsmTime (AssertAction A)
 /* Return true if this assertion should be evaluated at assembly time */
-{            
+{
     return (A & 0x02U) == 0;
 }
 
diff --git a/src/common/attrib.h b/src/common/attrib.h
index 7ff01a608..cb9d9195c 100644
--- a/src/common/attrib.h
+++ b/src/common/attrib.h
@@ -6,10 +6,10 @@
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */
-/* (C) 2000     Ullrich von Bassewitz                                        */
-/*              Wacholderweg 14                                              */
-/*              D-70597 Stuttgart                                            */
-/* EMail:       uz@musoftware.de                                             */
+/* (C) 2000-2009, Ullrich von Bassewitz                                      */
+/*                Roemerstrasse 52                                           */
+/*                D-70794 Filderstadt                                        */
+/* EMail:         uz@cc65.org                                                */
 /*                                                                           */
 /*                                                                           */
 /* This software is provided 'as-is', without any expressed or implied       */
@@ -44,10 +44,10 @@
 
 
 
-#if defined(__GNUC__)
+#if defined(__GNUC__) || defined(__CC65__)
 #  define attribute(a)	__attribute__(a)
 #else
-#  define attribute(a)	
+#  define attribute(a)
 #endif