--- a/make/RunTestsPrebuilt.gmk	Mon Nov 27 14:17:16 2017 +0100
+++ b/make/RunTestsPrebuilt.gmk	Mon Nov 27 14:24:23 2017 +0100
@@ -117,8 +117,8 @@
     JDK_IMAGE_DIR := $(JDK_IMAGE_DIR), \
     TEST_IMAGE_DIR := $(TEST_IMAGE_DIR), \
     JT_HOME := $(JT_HOME), \
+    include $(TOPDIR)/make/RunTestsPrebuiltSpec.gmk, \
     $(CUSTOM_NEW_SPEC_LINE), \
-    include $(TOPDIR)/make/RunTestsPrebuiltSpec.gmk, \
 )