diff --git a/scripts/geodata/i18n/unicode_properties.py b/scripts/geodata/i18n/unicode_properties.py
index 565421af..ff393779 100644
--- a/scripts/geodata/i18n/unicode_properties.py
+++ b/scripts/geodata/i18n/unicode_properties.py
@@ -38,6 +38,7 @@ from word_breaks import script_regex, regex_char_range
 
 SCRIPTS_DATA_DIR = os.path.join(UNICODE_DATA_DIR, 'scripts')
 LOCAL_SCRIPTS_FILE = os.path.join(SCRIPTS_DATA_DIR, 'Scripts.txt')
+LOCAL_ISO_15924_FILE = os.path.join(SCRIPTS_DATA_DIR, 'iso15924.txt')
 
 BLOCKS_DATA_DIR = os.path.join(UNICODE_DATA_DIR, 'blocks')
 LOCAL_BLOCKS_FILE = os.path.join(BLOCKS_DATA_DIR, 'Blocks.txt')
@@ -268,19 +269,26 @@ SCRIPT_ALIASES_SUPPLEMENTAL = {
 
 
 def get_script_codes(all_scripts):
-    temp_dir = tempfile.gettempdir()
-    script_codes_filename = os.path.join(temp_dir, ISO_15924_URL.rsplit('/')[-1])
 
-    # This comes as a .zip
-    script_codes_response = requests.get(ISO_15924_URL)
-    zf = ZipFile(StringIO(script_codes_response.content))
-    iso15924_filename = [name for name in zf.namelist() if name.startswith('iso15924')][0]
+    if not os.path.exists(LOCAL_ISO_15924_FILE):
+        temp_dir = tempfile.gettempdir()
 
-    # Strip out the comments, etc.
-    temp_iso15924_file = u'\n'.join([line.rstrip() for line in safe_decode(zf.read(iso15924_filename)).split('\n')
-                                    if line.strip() and not line.strip().startswith('#')])
+        script_codes_filename = os.path.join(temp_dir, ISO_15924_URL.rsplit('/')[-1])
 
-    script_codes_file = StringIO(safe_encode(temp_iso15924_file))
+        # This comes as a .zip
+        script_codes_response = requests.get(ISO_15924_URL)
+        zf = ZipFile(StringIO(script_codes_response.content))
+        iso15924_filename = [name for name in zf.namelist() if name.startswith('iso15924')][0]
+
+        # Strip out the comments, etc.
+        temp_iso15924_file = u'\n'.join([line.rstrip() for line in safe_decode(zf.read(iso15924_filename)).split('\n')
+                                        if line.strip() and not line.strip().startswith('#')])
+
+        f = open(LOCAL_ISO_15924_FILE, 'w')
+        f.write(safe_encode(temp_iso15924_file))
+        f.close()
+
+    script_codes_file = open(LOCAL_ISO_15924_FILE)
 
     script_codes = {}
     seen_scripts = set()