diff --git a/.tox-install.sh b/.tox-install.sh
index 95f5c1e70..ff22b4d79 100755
--- a/.tox-install.sh
+++ b/.tox-install.sh
@@ -2,8 +2,8 @@
 set -ex
 
 FLAVOR="$1"
-ENVPYTHON="$(realpath "$2")"
-ENVSITEPACKAGESDIR="$(realpath "$3")"
+ENVPYTHON="$(realpath -s "$2")"
+ENVSITEPACKAGESDIR="$(realpath -s "$3")"
 ENVDIR="$4"
 # 4...end are package requirements
 shift 4