diff --git a/contrib/intarray/_int_tool.c b/contrib/intarray/_int_tool.c
index ee8fb64a47..d86485dfa5 100644
--- a/contrib/intarray/_int_tool.c
+++ b/contrib/intarray/_int_tool.c
@@ -220,7 +220,16 @@ ArrayType *
 new_intArrayType(int num)
 {
 	ArrayType  *r;
-	int			nbytes = ARR_OVERHEAD_NONULLS(1) + sizeof(int) * num;
+	int			nbytes;
+
+	/* if no elements, return a zero-dimensional array */
+	if (num <= 0)
+	{
+		r = construct_empty_array(INT4OID);
+		return r;
+	}
+
+	nbytes = ARR_OVERHEAD_NONULLS(1) + sizeof(int) * num;
 
 	r = (ArrayType *) palloc0(nbytes);
 
@@ -237,11 +246,11 @@ new_intArrayType(int num)
 ArrayType *
 resize_intArrayType(ArrayType *a, int num)
 {
-	int			nbytes = ARR_DATA_OFFSET(a) + sizeof(int) * num;
+	int			nbytes;
 	int			i;
 
 	/* if no elements, return a zero-dimensional array */
-	if (num == 0)
+	if (num <= 0)
 	{
 		ARR_NDIM(a) = 0;
 		return a;
@@ -250,6 +259,8 @@ resize_intArrayType(ArrayType *a, int num)
 	if (num == ARRNELEMS(a))
 		return a;
 
+	nbytes = ARR_DATA_OFFSET(a) + sizeof(int) * num;
+
 	a = (ArrayType *) repalloc(a, nbytes);
 
 	SET_VARSIZE(a, nbytes);
diff --git a/contrib/intarray/expected/_int.out b/contrib/intarray/expected/_int.out
index 0a5dd463ac..105c951bad 100644
--- a/contrib/intarray/expected/_int.out
+++ b/contrib/intarray/expected/_int.out
@@ -151,6 +151,30 @@ SELECT '{-1,3,1}'::int[] & '{1,2}';
  {1}
 (1 row)
 
+SELECT '{1}'::int[] & '{2}'::int[];
+ ?column? 
+----------
+ {}
+(1 row)
+
+SELECT array_dims('{1}'::int[] & '{2}'::int[]);
+ array_dims 
+------------
+ 
+(1 row)
+
+SELECT ('{1}'::int[] & '{2}'::int[]) = '{}'::int[];
+ ?column? 
+----------
+ t
+(1 row)
+
+SELECT ('{}'::int[] & '{}'::int[]) = '{}'::int[];
+ ?column? 
+----------
+ t
+(1 row)
+
 --test query_int
 SELECT '1'::query_int;
  query_int 
diff --git a/contrib/intarray/sql/_int.sql b/contrib/intarray/sql/_int.sql
index 44e1a729b4..40225c65ab 100644
--- a/contrib/intarray/sql/_int.sql
+++ b/contrib/intarray/sql/_int.sql
@@ -30,6 +30,10 @@ SELECT '{123,623,445}'::int[] | 1623;
 SELECT '{123,623,445}'::int[] | '{1623,623}';
 SELECT '{123,623,445}'::int[] & '{1623,623}';
 SELECT '{-1,3,1}'::int[] & '{1,2}';
+SELECT '{1}'::int[] & '{2}'::int[];
+SELECT array_dims('{1}'::int[] & '{2}'::int[]);
+SELECT ('{1}'::int[] & '{2}'::int[]) = '{}'::int[];
+SELECT ('{}'::int[] & '{}'::int[]) = '{}'::int[];
 
 
 --test query_int