diff --git a/contrib/intarray/_int_tool.c b/contrib/intarray/_int_tool.c
index fead4ff30dc..1c6b7301a2b 100644
--- a/contrib/intarray/_int_tool.c
+++ b/contrib/intarray/_int_tool.c
@@ -139,7 +139,8 @@ inner_int_inter(ArrayType *a, ArrayType *b)
 			   *db,
 			   *dr;
 	int			i,
-				j;
+				j,
+				k;
 
 	CHECKARRVALID(a);
 	CHECKARRVALID(b);
@@ -154,27 +155,29 @@ inner_int_inter(ArrayType *a, ArrayType *b)
 	r = new_intArrayType(Min(na, nb));
 	dr = ARRPTR(r);
 
-	i = j = 0;
+	i = j = k = 0;
 	while (i < na && j < nb)
+	{
 		if (da[i] < db[j])
 			i++;
 		else if (da[i] == db[j])
 		{
-			if (i + j == 0 || (i + j > 0 && *(dr - 1) != db[j]))
-				*dr++ = db[j];
+			if (k == 0 || dr[k - 1] != db[j])
+				dr[k++] = db[j];
 			i++;
 			j++;
 		}
 		else
 			j++;
+	}
 
-	if ((dr - ARRPTR(r)) == 0)
+	if (k == 0)
 	{
 		pfree(r);
 		return new_intArrayType(0);
 	}
 	else
-		return resize_intArrayType(r, dr - ARRPTR(r));
+		return resize_intArrayType(r, k);
 }
 
 void
diff --git a/contrib/intarray/expected/_int.out b/contrib/intarray/expected/_int.out
index 596439d3149..ab28ad33de1 100644
--- a/contrib/intarray/expected/_int.out
+++ b/contrib/intarray/expected/_int.out
@@ -143,6 +143,12 @@ SELECT '{123,623,445}'::int[] & '{1623,623}';
  {623}
 (1 row)
 
+SELECT '{-1,3,1}'::int[] & '{1,2}';
+ ?column? 
+----------
+ {1}
+(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 1588e3b5145..d020c5fa8e3 100644
--- a/contrib/intarray/sql/_int.sql
+++ b/contrib/intarray/sql/_int.sql
@@ -32,6 +32,7 @@ SELECT '{123,623,445}'::int[] | 623;
 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}';
 
 
 --test query_int