diff --git a/harbour/include/error.ch b/harbour/include/error.ch
index 17cd36c1e5..10165621f4 100644
--- a/harbour/include/error.ch
+++ b/harbour/include/error.ch
@@ -133,6 +133,6 @@
 #define HB_EI_XMEMOVERFLOW      9022 /* "Memory buffer overflow" */
 #define HB_EI_XGRABNULLSIZE     9023 /* "hb_xgrab requested to allocate zero byte" */
 #define HB_EI_XREALLOCNULLSIZE  9024 /* "hb_xrealloc requested to resize to zero byte" */
+#define HB_EI_XALLOCNULLSIZE    9025 /* "hb_xalloc requested to allocate zero byte" */
 
 #endif /* _ERROR_CH */
-