diff --git a/tests/conftest.py b/tests/conftest.py
index dedcfd8..b681372 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -15,6 +15,10 @@ from vdb.vdb import (
     set_evm_opcode_debugger,
     VyperDebugCmd
 )
+from vdb.eth_tester_debug_backend import (
+    PyEVMDebugBackend,
+    set_debug_info
+)
 from vdb.source_map import (
     produce_source_map
 )
@@ -22,7 +26,7 @@ from vdb.source_map import (
 
 @pytest.fixture(scope="module")
 def tester():
-    t = EthereumTester()
+    t = EthereumTester(backend=PyEVMDebugBackend())
     return t
 
 
@@ -46,10 +50,9 @@ def _get_contract(w3, source_code, *args, **kwargs):
     stdout = kwargs['stdout'] if 'stdout' in kwargs else None
 
     source_map = produce_source_map(source_code)
-    set_evm_opcode_debugger(
-        source_code=source_code, source_map=source_map, stdin=stdin, stdout=stdout
-    )
-
+    set_debug_info(source_code, source_map, stdin, stdout)
+    import vdb
+    setattr(vdb.debug_computation.DebugComputation, 'enable_debug', True)
     value = kwargs.pop('value', 0)
     value_in_eth = kwargs.pop('value_in_eth', 0)
     value = value_in_eth * 10**18 if value_in_eth else value  # Handle deploying with an eth value.
diff --git a/vdb/debug_computation.py b/vdb/debug_computation.py
index a9083e3..8b67a82 100644
--- a/vdb/debug_computation.py
+++ b/vdb/debug_computation.py
@@ -11,6 +11,8 @@ class DebugComputation(ByzantiumComputation):
     enable_debug = False
     source_code = None
     source_map = None
+    stdin = None
+    stdout = None
 
     @classmethod
     def run_debugger(self, computation, line_no):
@@ -19,8 +21,8 @@ class DebugComputation(ByzantiumComputation):
             line_no=line_no,
             source_code=self.source_code,
             source_map=self.source_map,
-            stdin=None,
-            stdout=None
+            stdin=self.stdin,
+            stdout=self.stdout
         ).cmdloop()
         return line_no
 
diff --git a/vdb/eth_tester_debug_backend.py b/vdb/eth_tester_debug_backend.py
index 8dd3902..85d34ea 100644
--- a/vdb/eth_tester_debug_backend.py
+++ b/vdb/eth_tester_debug_backend.py
@@ -52,6 +52,8 @@ class PyEVMDebugBackend(PyEVMBackend):
         self.account_keys, self.chain = _setup_tester_chain()
 
 
-def set_debug_info(source_code, source_map):
+def set_debug_info(source_code, source_map, stdin=None, stdout=None):
     setattr(DebugComputation, 'source_code', source_code)
     setattr(DebugComputation, 'source_map', source_map)
+    setattr(DebugComputation, 'stdin', stdin)
+    setattr(DebugComputation, 'stdout', stdout)