diff --git a/builder-build b/builder-build
index f155d42..83d27d4 100755
--- a/builder-build
+++ b/builder-build
@@ -33,7 +33,11 @@ trigger-builder-nixpacks-builder-build() {
   for flag in $NIXPACKS_FLAGS ; do
     local value="$(fn-plugin-property-get "builder-nixpacks" "$APP" "$flag")"
     if [[ -n "$value" ]] ; then
-      NIXPACKS_ARGS="${NIXPACKS_ARGS}--${flag}=${value// /\\ } "
+      if [[ "$value" =~ " " ]] ; then
+        NIXPACKS_ARGS="${NIXPACKS_ARGS}--${flag}='${value}' "
+      else
+        NIXPACKS_ARGS="${NIXPACKS_ARGS}--${flag}=${value} "
+      fi
     fi
   done