diff --git a/end-to-end.sh b/end-to-end.sh
index e57c8b1b..dc2e3fe6 100755
--- a/end-to-end.sh
+++ b/end-to-end.sh
@@ -3,13 +3,13 @@
 
 SELF_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 SELF="${BASH_SOURCE[0]}"
-source $SELF_DIR/lib/lib.sh
+source "$SELF_DIR/lib/lib.sh"
 
-source $SELF_DIR/federation/federation.sh
-source $SELF_DIR/actions/actions.sh
-source $SELF_DIR/forgejo/fixtures.sh
-source $SELF_DIR/storage/storage.sh
-source $SELF_DIR/upgrade/upgrade.sh
-source $SELF_DIR/packages/packages.sh
+source "$SELF_DIR/federation/federation.sh"
+source "$SELF_DIR/actions/actions.sh"
+source "$SELF_DIR/forgejo/fixtures.sh"
+source "$SELF_DIR/storage/storage.sh"
+source "$SELF_DIR/upgrade/upgrade.sh"
+source "$SELF_DIR/packages/packages.sh"
 
 "$@"