diff --git a/src/helpers.py b/src/helpers.py
index 341c70f..78fc6f7 100644
--- a/src/helpers.py
+++ b/src/helpers.py
@@ -143,22 +143,21 @@ def export_all_zones(trigger_path: str = "filesystem-change") -> list[Path]:
     return written_files
 
 
-def replace_type_codes(content):
-    pattern = re.compile(r'(RRSIG\s+)(\d+)(\s+)')
-
-    def repl(match):
-        num = int(match.group(2))
-        try:
-            text_type = dns.rdatatype.to_text(dns.rdatatype.RdataType(num))
-            return f"{match.group(1)}{text_type}{match.group(3)}"
-        except Exception as e:
-            logging.warning(e)
-            return match.group(0)
-
-    return pattern.sub(repl, content)
-
-
 def validate_zone(zone_name, content) -> bool:
+    def replace_type_codes(content):
+        pattern = re.compile(r'(RRSIG\s+)(\d+)(\s+)')
+
+        def repl(match):
+            num = int(match.group(2))
+            try:
+                text_type = dns.rdatatype.to_text(dns.rdatatype.RdataType(num))
+                return f"{match.group(1)}{text_type}{match.group(3)}"
+            except Exception as e:
+                logging.warning(e)
+                return match.group(0)
+
+        return pattern.sub(repl, content)
+
     try:
         dns.zone.from_text(replace_type_codes(content), zone_name + '.', relativize=False)
         logging.info(f"Zone {zone_name} parsed successfully")