diff --git a/python/tox.ini b/python/tox.ini
index 38a81b4..4eb319d 100644
--- a/python/tox.ini
+++ b/python/tox.ini
@@ -4,7 +4,8 @@
 
 [testenv]
 usedevelop=true
-passenv = CC
+passenv = 
+    CC KOKORO_BUILD_ID KOKORO_BUILD_NUMBER
 setenv =
     cpp: LD_LIBRARY_PATH={toxinidir}/../src/.libs
     cpp: DYLD_LIBRARY_PATH={toxinidir}/../src/.libs