diff --git a/src/a.out b/src/a.out
index 765a2aa9..d848b3c9 100755
Binary files a/src/a.out and b/src/a.out differ
diff --git a/src/mad.h b/src/mad.h
index 0c4b079e..f55e7bee 100644
--- a/src/mad.h
+++ b/src/mad.h
@@ -9,9 +9,11 @@
 
 namespace mad {
 
-typedef float Tensor;
+typedef float Tensor; // Now do this for cuDNN tensors!
+struct Chainable;
 
 boost::pool<> p(sizeof(char));
+std::vector<Chainable*> stack;
 
 struct Chainable {
     Chainable() { }
@@ -26,8 +28,6 @@ struct Chainable {
     }
 };
 
-std::vector<Chainable*> stack;
-
 class Vimpl : public Chainable {
   public:
     Vimpl(const Tensor& t) : val_{std::move(t)}, adj_{0} {
diff --git a/src/test.cpp b/src/test.cpp
index 6f29902c..95e88f89 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -1,4 +1,5 @@
 #include <iostream>
+#include <ctime>
 
 #include "mad.h"
 
@@ -6,13 +7,17 @@ int main(int argc, char** argv) {
     
     using namespace mad;
     {
+        srand(time(NULL));
+        size_t max = rand() % 20 + 1;
+        
         Var x0 = 1, x1 = 2, x2 = 3;
         
-        auto y = x0 + x0 + log(x2) + x1;
+        Var y = 0.0;
+        for(int i = 0; i < max; i++)
+            y = y + x0 + log(x2) + x1;
         
         std::vector<Var> x = { x0, x1, x2 };
-        
-        
+           
         set_zero_all_adjoints();
         y.grad();