diff --git a/site_ansto/instrument/util/gen_sct.py b/site_ansto/instrument/util/gen_sct.py
index f459dd59..f1d1f810 100755
--- a/site_ansto/instrument/util/gen_sct.py
+++ b/site_ansto/instrument/util/gen_sct.py
@@ -30,6 +30,7 @@
 #
 
 import os
+import re
 import ply.lex as lex
 import ply.yacc as yacc
 
@@ -1808,6 +1809,11 @@ def load_file(source_file, depth_list):
             #print trial_name
             if os.path.isfile(trial_name):
                 SourceFile =  os.path.realpath(os.path.abspath(trial_name))
+    if SourceFile in depth_list:
+        PrintPostError('Error: recursive include of: %s' % SourceFile)
+        for idx, name in enumerate(depth_list):
+            PrintPostError('  ' * idx + name)
+        raise Exception('Bad recursive include of "' + SourceFile + '"')
     SourceFileList.append(SourceFile)
     curr_file = len(SourceFileList) - 1
     fd = open(SourceFile, 'r')
@@ -1816,6 +1822,11 @@ def load_file(source_file, depth_list):
     for line in fd:
         line_no += 1
         line = line.rstrip('\n')
+        match = re.match(r'\s*%include\s+', line, flags=re.IGNORECASE)
+        if match:
+            new_source = re.sub(r'\s*%include\s+(.*)', r'\1', line, flags=re.IGNORECASE)
+            LocalData += load_file(new_source, depth_list + [SourceFile])
+            continue
         LocalData.append(line)
         SourceLineList.append((curr_file, line_no))
     fd.close()