diff --git a/stix2/patterns.py b/stix2/patterns.py
index bbee7ac..f1472cd 100644
--- a/stix2/patterns.py
+++ b/stix2/patterns.py
@@ -227,7 +227,7 @@ def make_constant(value):
         return value
 
     try:
-        return parse_into_datetime(value)
+        return TimestampConstant(value)
     except (ValueError, TypeError):
         pass