diff --git a/contrib/intarray/_int_gist.c b/contrib/intarray/_int_gist.c
index 1213c5250f8..62cd9ba9794 100644
--- a/contrib/intarray/_int_gist.c
+++ b/contrib/intarray/_int_gist.c
@@ -287,8 +287,7 @@ g_int_decompress(PG_FUNCTION_ARGS)
 	ArrayType  *in;
 	int			lenin;
 	int		   *din;
-	int			i,
-				j;
+	int			i;
 
 	in = DatumGetArrayTypeP(entry->key);
 
@@ -332,9 +331,12 @@ g_int_decompress(PG_FUNCTION_ARGS)
 	dr = ARRPTR(r);
 
 	for (i = 0; i < lenin; i += 2)
-		for (j = din[i]; j <= din[i + 1]; j++)
+	{
+		/* use int64 for j in case din[i + 1] is INT_MAX */
+		for (int64 j = din[i]; j <= din[i + 1]; j++)
 			if ((!i) || *(dr - 1) != j)
-				*dr++ = j;
+				*dr++ = (int) j;
+	}
 
 	if (in != (ArrayType *) DatumGetPointer(entry->key))
 		pfree(in);
diff --git a/contrib/intarray/data/test__int.data b/contrib/intarray/data/test__int.data
index b3903d0f33a..0a7fac3c087 100644
--- a/contrib/intarray/data/test__int.data
+++ b/contrib/intarray/data/test__int.data
@@ -6998,3 +6998,4 @@
 {173,208,229}
 {6,22,142,267,299}
 {22,122,173,245,293}
+{1,2,101,102,201,202,2147483647}
diff --git a/contrib/intarray/expected/_int.out b/contrib/intarray/expected/_int.out
index d6218df47f8..28ba5bdba99 100644
--- a/contrib/intarray/expected/_int.out
+++ b/contrib/intarray/expected/_int.out
@@ -464,13 +464,13 @@ SELECT count(*) from test__int WHERE a @@ '(20&23)|(50&68)';
 SELECT count(*) from test__int WHERE a @@ '20 | !21';
  count 
 -------
-  6566
+  6567
 (1 row)
 
 SELECT count(*) from test__int WHERE a @@ '!20 & !21';
  count 
 -------
-  6343
+  6344
 (1 row)
 
 SET enable_seqscan = off;  -- not all of these would use index by default
@@ -538,13 +538,13 @@ SELECT count(*) from test__int WHERE a @@ '(20&23)|(50&68)';
 SELECT count(*) from test__int WHERE a @@ '20 | !21';
  count 
 -------
-  6566
+  6567
 (1 row)
 
 SELECT count(*) from test__int WHERE a @@ '!20 & !21';
  count 
 -------
-  6343
+  6344
 (1 row)
 
 INSERT INTO test__int SELECT array(SELECT x FROM generate_series(1, 1001) x); -- should fail
@@ -614,13 +614,13 @@ SELECT count(*) from test__int WHERE a @@ '(20&23)|(50&68)';
 SELECT count(*) from test__int WHERE a @@ '20 | !21';
  count 
 -------
-  6566
+  6567
 (1 row)
 
 SELECT count(*) from test__int WHERE a @@ '!20 & !21';
  count 
 -------
-  6343
+  6344
 (1 row)
 
 DROP INDEX text_idx;
@@ -688,13 +688,13 @@ SELECT count(*) from test__int WHERE a @@ '(20&23)|(50&68)';
 SELECT count(*) from test__int WHERE a @@ '20 | !21';
  count 
 -------
-  6566
+  6567
 (1 row)
 
 SELECT count(*) from test__int WHERE a @@ '!20 & !21';
  count 
 -------
-  6343
+  6344
 (1 row)
 
 RESET enable_seqscan;