diff --git a/src/include/h5core/h5_log.h b/src/include/h5core/h5_log.h
index c0dee76..4190c54 100644
--- a/src/include/h5core/h5_log.h
+++ b/src/include/h5core/h5_log.h
@@ -35,6 +35,7 @@ extern const char* H5_VER_STRING;
 #define H5_DEBUG_MALLOC		(1<<9)
 #define H5_DEBUG_CLIB		(1<<10)
 
+#define H5_DEBUG_NONE		(0)
 #define H5_DEBUG_ALL		(-1 & ~0x3)
 
 extern char* h5_rfmts[];