diff --git a/protonkey b/protonkey
index 401253b..898af09 100755
--- a/protonkey
+++ b/protonkey
@@ -19,16 +19,16 @@
 
 argv0="$0"
 
-if test -z "$1"; then
-  printf "Usage: %s [ProtonMail address...]\n" "$argv0" 1>&2
-  exit 64 # syexits(3) EX_USAGE
-fi
-
 if ! command -v curl > /dev/null; then
   printf "%s: Missing dependency: curl(1)\n" "$0" 1>&2
   exit 69 # sysexits(3) EX_UNAVAILABLE
 fi
 
+if test -z "$1"; then
+  printf "Usage: %s [ProtonMail address...]\n" "$argv0" 1>&2
+  exit 64 # syexits(3) EX_USAGE
+fi
+
 while test -n "$1"; do
   URL="https://api.protonmail.ch/pks/lookup?op=get&search=$1"
   RESPONSE="$(curl -s "$URL")"