diff --git a/builder-build b/builder-build
index 83d27d4..2b31b1b 100755
--- a/builder-build
+++ b/builder-build
@@ -34,9 +34,9 @@ trigger-builder-nixpacks-builder-build() {
     local value="$(fn-plugin-property-get "builder-nixpacks" "$APP" "$flag")"
     if [[ -n "$value" ]] ; then
       if [[ "$value" =~ " " ]] ; then
-        NIXPACKS_ARGS="${NIXPACKS_ARGS}--${flag}='${value}' "
+        NIXPACKS_ARGS="${NIXPACKS_ARGS}--${flag} \"${value}\" "
       else
-        NIXPACKS_ARGS="${NIXPACKS_ARGS}--${flag}=${value} "
+        NIXPACKS_ARGS="${NIXPACKS_ARGS}--${flag} ${value} "
       fi
     fi
   done