diff --git a/test/Driver/CommandHistory.C b/test/Driver/CommandHistory.C
index aefda3ce..e00071d6 100644
--- a/test/Driver/CommandHistory.C
+++ b/test/Driver/CommandHistory.C
@@ -8,7 +8,7 @@
 
 // clang-format off
 // RUN: %rm /tmp/__testing_cling_history
-// RUN: cat %s | env --unset=CLING_NOHISTORY CLING_HISTSIZE=8 CLING_HISTFILE="/tmp/__testing_cling_history" %cling - 2>&1
+// RUN: cat %s | env -u CLING_NOHISTORY CLING_HISTSIZE=8 CLING_HISTFILE="/tmp/__testing_cling_history" %cling - 2>&1
 // RUN: diff /tmp/__testing_cling_history "%S/Inputs/cling_history"
 // UNSUPPORTED: system-windows