diff --git a/src/common/stringinfo.c b/src/common/stringinfo.c
index ec5fc2422d8..eb9d6502fc8 100644
--- a/src/common/stringinfo.c
+++ b/src/common/stringinfo.c
@@ -311,13 +311,13 @@ enlargeStringInfo(StringInfo str, int needed)
 #ifndef FRONTEND
 		ereport(ERROR,
 				(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
-				 errmsg("out of memory"),
+				 errmsg("string buffer exceeds maximum allowed length (%zu bytes)", MaxAllocSize),
 				 errdetail("Cannot enlarge string buffer containing %d bytes by %d more bytes.",
 						   str->len, needed)));
 #else
 		fprintf(stderr,
-				_("out of memory\n\nCannot enlarge string buffer containing %d bytes by %d more bytes.\n"),
-				str->len, needed);
+				_("string buffer exceeds maximum allowed length (%zu bytes)\n\nCannot enlarge string buffer containing %d bytes by %d more bytes.\n"),
+				MaxAllocSize, str->len, needed);
 		exit(EXIT_FAILURE);
 #endif
 	}