diff --git a/doc/apiref.rst b/doc/apiref.rst
index 24b6085..198c0c2 100644
--- a/doc/apiref.rst
+++ b/doc/apiref.rst
@@ -516,7 +516,7 @@ in an array.
    :type:`json_t *` respectively. Example::
 
        /* array is a JSON array */
-       int index;
+       size_t index;
        json_t *value;
 
        json_array_foreach(array, index, value) {
diff --git a/test/suites/api/test_array.c b/test/suites/api/test_array.c
index c000775..51d47ed 100644
--- a/test/suites/api/test_array.c
+++ b/test/suites/api/test_array.c
@@ -402,7 +402,7 @@ static void test_circular()
 
 static void test_array_foreach()
 {
-    int index;
+    size_t index;
     json_t *array1, *array2, *value;
 
     array1 = json_pack("[sisisi]", "foo", 1, "bar", 2, "baz", 3);