diff --git a/backend/scripts/start-dev b/backend/scripts/start-dev
index 742f81303..6322a27b3 100755
--- a/backend/scripts/start-dev
+++ b/backend/scripts/start-dev
@@ -12,6 +12,7 @@ export PENPOT_FLAGS="\
        enable-audit-log \
        enable-transit-readable-response \
        enable-demo-users \
+       enable-file-validation \
        enable-feature-fdata-pointer-map \
        enable-feature-fdata-objects-map \
        disable-secure-session-cookies \