diff --git a/src/vectorflow/layers.d b/src/vectorflow/layers.d
index b42d1c6..aeb4123 100644
--- a/src/vectorflow/layers.d
+++ b/src/vectorflow/layers.d
@@ -473,7 +473,7 @@ class ReLU : NeuralLayer {
         }
     }
 
-    override void accumulate_grad(V)(V[] grad)
+    void accumulate_grad(V)(V[] grad)
         if ((is(V == float) || is(V == SparseF)))
     {
         ulong offset = 0;
diff --git a/src/vectorflow/neurallayer.d b/src/vectorflow/neurallayer.d
index e7eab5c..0ab8e34 100644
--- a/src/vectorflow/neurallayer.d
+++ b/src/vectorflow/neurallayer.d
@@ -240,10 +240,10 @@ abstract class InputLayer : NeuralLayer
 
     abstract override void predict();
     
-    override void accumulate_grad(V)(V[] grad) pure
+    void accumulate_grad(V)(V[] grad) pure
         if ((is(V == float) || is(V == SparseF))) {}
 
-    override void backward_prop(V)(V[] grad) pure
+    void backward_prop(V)(V[] grad) pure
         if ((is(V == float) || is(V == SparseF))) {}
 
     override @property ulong num_params(){return 0;}