diff --git a/dehydrated b/dehydrated
index dc9265e..5c6af3f 100755
--- a/dehydrated
+++ b/dehydrated
@@ -34,7 +34,7 @@ check_dependencies() {
   openssl version > /dev/null 2>&1 || _exiterr "This script requires an openssl binary."
   _sed "" < /dev/null > /dev/null 2>&1 || _exiterr "This script requires sed with support for extended (modern) regular expressions."
   command -v grep > /dev/null 2>&1 || _exiterr "This script requires grep."
-  _mktemp -u > /dev/null 2>&1 || _exiterr "This script requires mktemp."
+  command -v mktemp > /dev/null 2>&1 || _exiterr "This script requires mktemp."
   diff -u /dev/null /dev/null || _exiterr "This script requires diff."
 
   # curl returns with an error code in some ancient versions so we have to catch that