diff --git a/redbot/core/commands/converter.py b/redbot/core/commands/converter.py
index 43c41cb15..9c96be703 100644
--- a/redbot/core/commands/converter.py
+++ b/redbot/core/commands/converter.py
@@ -76,7 +76,7 @@ def _parse_and_match(string_to_match: str, allowed_units: List[str]) -> Optional
     """
     Local utility function to match TIME_RE string above to user input for both parse_timedelta and parse_relativedelta
     """
-    matches = TIME_RE.match(string_to_match)
+    matches = TIME_RE.fullmatch(string_to_match)
     if matches:
         params = {k: int(v) for k, v in matches.groupdict().items() if v is not None}
         for k in params.keys():