diff --git a/include/cdio/ecma_167.h b/include/cdio/ecma_167.h
index 43aef8f0..a3a5f538 100644
--- a/include/cdio/ecma_167.h
+++ b/include/cdio/ecma_167.h
@@ -164,6 +164,16 @@ struct vol_struct_desc_s
 #define VSD_STD_ID_NSR02		"NSR02"	/* (3/9.1) */
 
 /** Standard Identifier (ECMA 167r3 2/9.1.2) */
+
+/* The below const definitions are to faciltate debugging of the
+   values #define'd below. */
+extern const char VSD_STD_ID_BEA01[sizeof("BEA01")-1];
+extern const char VSD_STD_ID_BOOT2[sizeof("BOOT2")-1];
+extern const char VSD_STD_ID_CD001[sizeof("CD001")-1];
+extern const char VSD_STD_ID_CDW01[sizeof("CDW02")-1];
+extern const char VSD_STD_ID_NSR03[sizeof("NSR03")-1];
+extern const char VSD_STD_ID_TEA01[sizeof("TEA01")-1];
+
 #define VSD_STD_ID_BEA01		"BEA01"	/**< (2/9.2) */
 #define VSD_STD_ID_BOOT2		"BOOT2"	/**< (2/9.4) */
 #define VSD_STD_ID_CD001		"CD001"	/**< (ECMA-119) */