diff --git a/src/test/regress/expected/select_distinct.out b/src/test/regress/expected/select_distinct.out
index fe64fe0d9c1..3b5200b17a9 100644
--- a/src/test/regress/expected/select_distinct.out
+++ b/src/test/regress/expected/select_distinct.out
@@ -4,7 +4,7 @@
 --
 -- awk '{print $3;}' onek.data | sort -n | uniq
 --
-SELECT DISTINCT two FROM tmp;
+SELECT DISTINCT two FROM tmp ORDER BY 1;
  two 
 -----
    0
diff --git a/src/test/regress/sql/select_distinct.sql b/src/test/regress/sql/select_distinct.sql
index 7416e0194e1..d97c397d06b 100644
--- a/src/test/regress/sql/select_distinct.sql
+++ b/src/test/regress/sql/select_distinct.sql
@@ -5,7 +5,7 @@
 --
 -- awk '{print $3;}' onek.data | sort -n | uniq
 --
-SELECT DISTINCT two FROM tmp;
+SELECT DISTINCT two FROM tmp ORDER BY 1;
 
 --
 -- awk '{print $5;}' onek.data | sort -n | uniq