diff --git a/streetlevel/streetview/protobuf.py b/streetlevel/streetview/protobuf.py
index 5cab87b..8943911 100644
--- a/streetlevel/streetview/protobuf.py
+++ b/streetlevel/streetview/protobuf.py
@@ -1,6 +1,6 @@
 # Some code to deal with the URL-encoded protobuf Google uses in Maps.
 from enum import Enum
-
+from decimal import Decimal
 
 class ProtobufType(Enum):
     """
@@ -88,6 +88,8 @@ def _get_datatype_str(value):
         datatype = ProtobufType.INT
     elif isinstance(value, float):
         datatype = ProtobufType.DOUBLE
+    elif isinstance(value, Decimal):
+        datatype = ProtobufType.DOUBLE
     elif isinstance(value, dict):
         datatype = ProtobufType.MESSAGE
     else: