diff --git a/fhirpathpy/engine/evaluators/__init__.py b/fhirpathpy/engine/evaluators/__init__.py
index e2b062c..583d84e 100644
--- a/fhirpathpy/engine/evaluators/__init__.py
+++ b/fhirpathpy/engine/evaluators/__init__.py
@@ -186,6 +186,9 @@ def func(acc, res):
         toAdd = None
         toAdd_ = None
 
+        if isinstance(res.data, nodes.FP_Quantity):
+            toAdd = res.data.value
+
         if isinstance(actualTypes, list):
             # Use actualTypes to find the field's value
             for actualType in actualTypes: