diff --git a/boa/environment.py b/boa/environment.py
index 4c11e40c..62e76def 100644
--- a/boa/environment.py
+++ b/boa/environment.py
@@ -723,7 +723,7 @@ def _hook_trace_computation(self, computation, contract=None):
             if child.msg.code_address == b"":
                 continue
             child_contract = self._lookup_contract_fast(child.msg.code_address)
-            self._hook_trace_computation(computation, child_contract)
+            self._hook_trace_computation(child, child_contract)
 
     # function to time travel
     def time_travel(
diff --git a/tests/unitary/test_coverage.py b/tests/unitary/test_coverage.py
new file mode 100644
index 00000000..4f49a605
--- /dev/null
+++ b/tests/unitary/test_coverage.py
@@ -0,0 +1,40 @@
+import pytest
+import boa
+
+
+@pytest.fixture(scope="module")
+def external_contract():
+    source_code = """
+@external
+@view
+def foo(a: uint256) -> uint256:
+    return a * a
+"""
+    return boa.loads(source_code, name="ExternalContract")
+
+
+@pytest.fixture(scope="module")
+def source_contract(external_contract):
+    source_code = """
+interface Foo:
+    def foo(a: uint256) -> uint256: view
+
+FOO: immutable(address)
+
+@external
+def __init__(_foo_address: address):
+    FOO = _foo_address
+
+@external
+@view
+def bar(b: uint256) -> uint256:
+    c: uint256 = Foo(FOO).foo(b)
+    return c
+"""
+    return boa.loads(source_code, external_contract.address, name="TestContract")
+
+
+def test_sub_computations(source_contract):
+    boa.env._coverage_enabled = True
+    source_contract.bar(10)
+