diff --git a/apps/antelope/aql-lexer.c b/apps/antelope/aql-lexer.c
index 0e98584ef..cad604efb 100644
--- a/apps/antelope/aql-lexer.c
+++ b/apps/antelope/aql-lexer.c
@@ -50,7 +50,7 @@ struct keyword {
 
 /* The keywords are arranged primarily by length and
    secondarily by expected lookup frequency. */
-static struct keyword keywords[] = {
+static const struct keyword keywords[] = {
   {";", END},
   {"(", LEFT_PAREN},
   {")", RIGHT_PAREN},