diff --git a/tox.ini b/tox.ini
index ee48184..9da0b22 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,6 +22,6 @@ deps =
     pytest>=6
 setenv =
     ; NB: You may need to copy build/fdb5/etc/fdb to build/etc/fdb
-    FDB5_HOME=../build/
+    FDB_HOME=../build/
 commands =
     pytest {tty:--color=yes} {posargs}