diff --git a/src/backend/statistics/extended_stats_funcs.c b/src/backend/statistics/extended_stats_funcs.c
index 6fff31330e6..db107684607 100644
--- a/src/backend/statistics/extended_stats_funcs.c
+++ b/src/backend/statistics/extended_stats_funcs.c
@@ -418,7 +418,7 @@ extended_statistics_update(FunctionCallInfo fcinfo)
 	{
 		ereport(WARNING,
 				errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-				errmsg("cannot not specify parameter \"%s\"",
+				errmsg("cannot specify parameter \"%s\"",
 					   extarginfo[NDISTINCT_ARG].argname),
 				errhint("Extended statistics object \"%s\".\"%s\" does not support statistics of this type.",
 						quote_identifier(nspname),
@@ -436,7 +436,7 @@ extended_statistics_update(FunctionCallInfo fcinfo)
 	{
 		ereport(WARNING,
 				errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-				errmsg("cannot specify parameter \"%s\".",
+				errmsg("cannot specify parameter \"%s\"",
 					   extarginfo[DEPENDENCIES_ARG].argname),
 				errhint("Extended statistics object \"%s\".\"%s\" does not support statistics of this type.",
 						quote_identifier(nspname),
diff --git a/src/test/regress/expected/stats_import.out b/src/test/regress/expected/stats_import.out
index 284a49bbc4e..37131f9ceab 100644
--- a/src/test/regress/expected/stats_import.out
+++ b/src/test/regress/expected/stats_import.out
@@ -1761,7 +1761,7 @@ SELECT pg_catalog.pg_restore_extended_stats(
   'statistics_name', 'test_stat_dependencies',
   'inherited', false,
   'n_distinct', '[{"attributes" : [1,3], "ndistinct" : 4}]'::pg_ndistinct);
-WARNING:  cannot not specify parameter "n_distinct"
+WARNING:  cannot specify parameter "n_distinct"
 HINT:  Extended statistics object "stats_import"."test_stat_dependencies" does not support statistics of this type.
  pg_restore_extended_stats 
 ---------------------------
@@ -1777,7 +1777,7 @@ SELECT pg_catalog.pg_restore_extended_stats(
   'inherited', false,
   'dependencies', '[{"attributes": [2], "dependency": 3, "degree": 1.000000},
                     {"attributes": [3], "dependency": 2, "degree": 1.000000}]'::pg_dependencies);
-WARNING:  cannot specify parameter "dependencies".
+WARNING:  cannot specify parameter "dependencies"
 HINT:  Extended statistics object "stats_import"."test_stat_ndistinct" does not support statistics of this type.
  pg_restore_extended_stats 
 ---------------------------