diff --git a/experiments/matrix-completion-hyperparameter-search.py b/experiments/matrix-completion-hyperparameter-search.py
index 16c1fa8a50030896e24a3c7d358da9168a467f02..100b92a3eea24727897d8aecbdc1ae7aa9baa954 100755
--- a/experiments/matrix-completion-hyperparameter-search.py
+++ b/experiments/matrix-completion-hyperparameter-search.py
@@ -219,7 +219,7 @@ if __name__ == "__main__":
             for hidden_layer_size1 in args.first_hidden_layer_sizes:
                 for hidden_layer_size2 in args.second_hidden_layer_sizes:
                     for activation in args.activation_functions:
-                        key = "%f,%d,%d,%s" % (
+                        key = "%f,%d,%d,%d,%s" % (
                             dropout,
                             embedding_dim_size,
                             hidden_layer_size1,