diff --git a/build_packages b/build_packages
index 247d365f3d..024074be1b 100755
--- a/build_packages
+++ b/build_packages
@@ -124,7 +124,7 @@ if [[ "${FLAGS_fast}" -eq "${FLAGS_TRUE}" ]]; then
 else
   EMERGE_CMD=( "emerge-${FLAGS_board}" )
 fi
-if [ "${FLAGS_fetchonly}" -eq "${FLAGS_TRUE}" ]; then
+if [[ "${FLAGS_fetchonly}" -eq "${FLAGS_TRUE}" ]]; then
   EMERGE_CMD+=( --fetchonly )
 fi