diff --git a/tivars/types/tokenized.py b/tivars/types/tokenized.py
index 38c5281..019405b 100644
--- a/tivars/types/tokenized.py
+++ b/tivars/types/tokenized.py
@@ -340,7 +340,7 @@ def name(self, value) -> str:
         varname = re.sub(r"[^θa-zA-Z0-9]", "", varname)
 
         if not varname or varname[0].isnumeric():
-            warn(f"Program has invalid an name: {varname}.",
+            warn(f"Program has an invalid name: {varname}.",
                  BytesWarning)
 
         return varname