diff --git a/src/bin/psql/tab-complete.c b/src/bin/psql/tab-complete.c
index d6fffcf..8b3bfff 100644
--- a/src/bin/psql/tab-complete.c
+++ b/src/bin/psql/tab-complete.c
@@ -1403,7 +1403,7 @@ psql_completion(const char *text, int start, int end)
 								   "UNION SELECT 'ALL IN TABLESPACE'");
 
 	/* ALTER something */
-	else if (Matches1("ALTER"))
+	else if (TailMatches1("ALTER"))
 	{
 		static const char *const list_ALTER[] =
 		{"AGGREGATE", "COLLATION", "CONVERSION", "DATABASE", "DEFAULT PRIVILEGES", "DOMAIN",