--- mkarchiso-v24	2016-02-28 16:50:52.000000000 -0500
+++ mkarchiso	2016-03-01 14:33:43.550409272 -0500
@@ -328,7 +328,9 @@
         _mkairootfs_img
     fi
     _mkchecksum
-    [[ ${gpg_key} ]] && _mksignature
+    if [[ ${gpg_key} ]]; then
+      _mksignature
+    fi
 }
 
 # Install packages on airootfs.