2 files changed, 2 insertions, 5 deletions
diff --git a/igor.py b/igor.py
index daf1053e..9d2d43a0 100644
--- a/igor.py
+++ b/igor.py
@@ -89,10 +89,7 @@ def should_skip(tracer):
     if tracer == "py":
         skipper = os.environ.get("COVERAGE_NO_PYTRACER")
     else:
-        skipper = (
-            os.environ.get("COVERAGE_NO_EXTENSION") or
-            os.environ.get("COVERAGE_NO_CTRACER")
-        )
+        skipper = os.environ.get("COVERAGE_NO_CTRACER")
 
     if skipper:
         msg = "Skipping tests " + label_for_tracer(tracer)
diff --git a/tox.ini b/tox.ini
index 8e698ccf..0e40f213 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,7 @@ install_command = python -m pip install -U {opts} {packages}
 
 passenv = *
 setenv =
-    pypy,pypy{2,3}: COVERAGE_NO_EXTENSION=no C extension under PyPy
+    pypy,pypy{2,3}: COVERAGE_NO_CTRACER=no C extension under PyPy
 
 commands =
     python setup.py --quiet clean develop