diff --git a/stub.bash b/stub.bash
index 52c319b..cf33308 100644
--- a/stub.bash
+++ b/stub.bash
@@ -1,4 +1,4 @@
-BATS_MOCK_TMPDIR="${BATS_TMPDIR}"
+BATS_MOCK_TMPDIR="${BATS_RUN_TMPDIR}"
 BATS_MOCK_BINDIR="${BATS_MOCK_TMPDIR}/bin"
 
 BATS_MOCK_REAL_mkdir=$(which mkdir)