diff --git a/gpgtool b/gpgtool
index 38be839..792a23c 100755
--- a/gpgtool
+++ b/gpgtool
@@ -243,7 +243,9 @@ extend () {
 send () {
   zparseopts -D -E -- -keyserver=servers:
 
-  [[ -z "${servers}" ]] && server=GPGTOOLKEYSERVERS
+  [[ -z "${servers}" ]] && servers=GPGTOOLKEYSERVERS
+
+  [[ -z "${servers}" ]] && echo "No key servers given, aborting …" && exit 1
 
   for id in $@
   do