diff --git a/themes/plain.sh b/themes/plain.sh
index 429230a..a0dad45 100644
--- a/themes/plain.sh
+++ b/themes/plain.sh
@@ -1,3 +1,7 @@
 WISH_DEFAULT_BG=-1
 WISH_DEFAULT_FG=-1
 WISH_POWERLINE=0
+for i in ${WISH_PLUGINS[@]}; do
+	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_BG=-1
+	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_FG=-1
+done