diff --git a/test/mail_with_postgrey_disabled_by_default.bats b/test/mail_with_postgrey_disabled_by_default.bats
index d0e9eb27..d71108b4 100644
--- a/test/mail_with_postgrey_disabled_by_default.bats
+++ b/test/mail_with_postgrey_disabled_by_default.bats
@@ -15,6 +15,6 @@ function teardown() {
 }
 
 @test "checking process: postgrey (disabled in default configuration)" {
-  run docker exec mail /bin/bash -c "ps aux --forest | grep -v grep | grep 'postgrey'"
+  run docker exec $CONTAINER /bin/bash -c "ps aux --forest | grep -v grep | grep 'postgrey'"
   assert_failure
 }
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