diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index a162de83..758751c6 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -378,7 +378,7 @@ class Evaluator(object):
                 pass
             else:
                 if comp_for == ':':
-                    # Dict comprehensions have it at the 3rd index.
+                    # Dict comprehensions have a colon at the 3rd index.
                     try:
                         comp_for = c[1].children[3]
                     except IndexError:
diff --git a/jedi/evaluate/iterable.py b/jedi/evaluate/iterable.py
index 9986c05e..3bbd7141 100644
--- a/jedi/evaluate/iterable.py
+++ b/jedi/evaluate/iterable.py
@@ -821,7 +821,11 @@ def create_index_types(evaluator, index):
     """
     Handles slices in subscript nodes.
     """
-    if tree.is_node(index, 'subscript'):  # subscript is a slice operation.
+    if index == ':':
+        # Like array[:]
+        return set([Slice(evaluator, None, None, None)])
+    elif tree.is_node(index, 'subscript'):  # subscript is a slice operation.
+        # Like array[:3]
         result = []
         for el in index.children:
             if el == ':':
@@ -835,4 +839,6 @@ def create_index_types(evaluator, index):
         result += [None] * (3 - len(result))
 
         return set([Slice(evaluator, *result)])
+
+    # No slices
     return evaluator.eval_element(index)
diff --git a/test/completion/arrays.py b/test/completion/arrays.py
index b6a565e2..938b9fdf 100644
--- a/test/completion/arrays.py
+++ b/test/completion/arrays.py
@@ -39,6 +39,9 @@ b[8:]
 #? list()
 b[int():]
 
+#? list()
+b[:]
+
 
 class _StrangeSlice():
     def __getitem__(self, sliced):