--- a/make/RunTestsPrebuilt.gmk	Wed Nov 29 23:28:21 2017 +0100
+++ b/make/RunTestsPrebuilt.gmk	Wed Nov 29 23:34:29 2017 +0100
@@ -85,12 +85,12 @@
 # $1: The output file name
 # $2..$N: The lines to output to the file
 define CreateNewSpec
-  $(if $(strip $(16)), \
+  $(if $(strip $(26)), \
     $(error Internal makefile error: \
       Too many arguments to macro, please update CreateNewSpec in RunTestsPrebuilt.gmk) \
   ) \
   $(shell rm -f $1) \
-  $(foreach i, 2 3 4 5 6 7 8 9 10 11 12 13 14 15, \
+  $(foreach i, 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25, \
     $(if $(strip $($i)), \
       $(call AppendFile, $(strip $($i)), $1) \
     ) \