1 files changed, 2 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index 95424765c3..bd313a4f36 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,8 @@ deps =
 setenv =
     PYTHONDONTWRITEBYTECODE = no_byte_code
 commands =
-    /bin/bash -c "coverage run --source=synapse {envbindir}/trial {env:TRIAL_FLAGS:} {posargs:tests} {env:TOXSUFFIX:}"
+    /bin/bash -c "coverage run {env:COVERAGE_OPTS:} --source={toxinidir}/synapse \
+        {envbindir}/trial {env:TRIAL_FLAGS:} {posargs:tests} {env:TOXSUFFIX:}"
     {env:DUMP_COVERAGE_COMMAND:coverage report -m}
 
 [testenv:packaging]