diff --git a/spacy/tests/vectors/test_vectors.py b/spacy/tests/vectors/test_vectors.py
index 0e4464d93..798871edd 100644
--- a/spacy/tests/vectors/test_vectors.py
+++ b/spacy/tests/vectors/test_vectors.py
@@ -40,11 +40,15 @@ def test_init_vectors_with_data(strings, data):
 
 def test_init_vectors_with_width(strings):
     v = Vectors(strings, 3)
+    for string in strings:
+        v.add(string)
     assert v.shape == (len(strings), 3)
 
 
 def test_get_vector(strings, data):
     v = Vectors(strings, data)
+    for string in strings:
+        v.add(string)
     assert list(v[strings[0]]) == list(data[0])
     assert list(v[strings[0]]) != list(data[1])
     assert list(v[strings[1]]) != list(data[0])
@@ -53,6 +57,8 @@ def test_get_vector(strings, data):
 def test_set_vector(strings, data):
     orig = data.copy()
     v = Vectors(strings, data)
+    for string in strings:
+        v.add(string)
     assert list(v[strings[0]]) == list(orig[0])
     assert list(v[strings[0]]) != list(orig[1])
     v[strings[0]] = data[1]