diff --git a/plugin.sh b/plugin.sh
index 0d051f1..1a647de 100755
--- a/plugin.sh
+++ b/plugin.sh
@@ -111,4 +111,4 @@ fi
     ${TARGET:-} \
     ${BUILD_ARGS:-} \
     ${BUILD_ARGS_FROM_ENV:-} \
-    ${MIRROR}
\ No newline at end of file
+    ${MIRROR:-}
\ No newline at end of file