--- a/scripts/xdg-mime.in	2017-10-11 00:05:11.535101057 +1000
+++ b/scripts/xdg-mime.in	2017-10-11 00:05:56.255847687 +1000
@@ -171,7 +171,7 @@
             blanks++
             suppress=1
         } else if (associations && index($0, prefix) == 1) {
-            value=substr($0, length(prefix) + 1, length)
+            value=substr($0, length(prefix) + 1, length())
             split(value, apps, ";")
             value=application ";"
             count=0
@@ -369,7 +369,7 @@
         } else if (index($0, "[") == 1) {
             indefault=0
         } else if (!found && indefault && index($0, prefix) == 1) {
-            print substr($0, length(prefix) +1, length)
+            print substr($0, length(prefix) +1, length())
             found=1
         }
     }