diff --git a/util/install/sandbox.sh b/util/install/sandbox.sh
index 145f3c5..6c24b77 100644
--- a/util/install/sandbox.sh
+++ b/util/install/sandbox.sh
@@ -68,7 +68,7 @@ done
 
 # my-passwords.yml is the file made by generate-passwords.sh.
 if [[ -f my-passwords.yml ]]; then
-    EXTRA_VARS="-e@my-passwords.yml $EXTRA_VARS"
+    EXTRA_VARS="-e@$(pwd)/my-passwords.yml $EXTRA_VARS"
 fi
 
 CONFIGURATION_VERSION=${CONFIGURATION_VERSION-${OPENEDX_RELEASE-master}}