diff --git a/tests/common.sh.in b/tests/common.sh.in
index e721c3696..097d94bb1 100644
--- a/tests/common.sh.in
+++ b/tests/common.sh.in
@@ -17,6 +17,7 @@ export NIX_CONF_DIR=$TEST_ROOT/etc
 export NIX_MANIFESTS_DIR=$TEST_ROOT/var/nix/manifests
 export _NIX_TEST_SHARED=$TEST_ROOT/shared
 export NIX_REMOTE=$NIX_REMOTE_
+unset NIX_PATH
 export TEST_HOME=$TEST_ROOT/test-home
 export HOME=$TEST_HOME
 mkdir -p $TEST_HOME