diff --git a/sarpy/io/general/nitf_elements/tres/tre_elements.py b/sarpy/io/general/nitf_elements/tres/tre_elements.py
index 487ed0de..cc55ff3c 100644
--- a/sarpy/io/general/nitf_elements/tres/tre_elements.py
+++ b/sarpy/io/general/nitf_elements/tres/tre_elements.py
@@ -174,7 +174,7 @@ def to_dict(self):
         out = OrderedDict()
         for fld in self._field_ordering:
             val = getattr(self, fld)
-            if val is None or isinstance(val, (bytes, str, int)):
+            if val is None or isinstance(val, (bytes, str, int, float)):
                 out[fld] = val
             elif isinstance(val, TREElement):
                 out[fld] = val.to_dict()