diff --git a/problems/recursion/sum_cubes.py b/problems/recursion/sum_cubes.py
index 5583c8c..0f14f0c 100644
--- a/problems/recursion/sum_cubes.py
+++ b/problems/recursion/sum_cubes.py
@@ -9,7 +9,7 @@ def sum_cubes(n):
     This function may not use any loops or list comprehensions.
     """
 
-    pass
+    return (n ** 3) + sum_cubes(n - 1)
 
 
 #############################################################
@@ -91,4 +91,4 @@ def test_sum_cubes_19():
     do_test_sum_cubes(81)
 
 def test_sum_cubes_20():
-    do_test_sum_cubes(100)
\ No newline at end of file
+    do_test_sum_cubes(100)