diff --git a/layer.h b/layer.h
index 3ac8fe0..f0c99e7 100644
--- a/layer.h
+++ b/layer.h
@@ -25,8 +25,13 @@ class Layer {
     // Constructors
     // Input size, Size
     Layer(int, int);
+    Layer();
 };
 
+Layer::Layer(){
+    
+}
+
 Layer::Layer(int input_size, int size){
     this->input = Matrix(input_size, 1);