diff --git a/fhirpathpy/engine/invocations/filtering.py b/fhirpathpy/engine/invocations/filtering.py
index 23e1d53..3c525bb 100644
--- a/fhirpathpy/engine/invocations/filtering.py
+++ b/fhirpathpy/engine/invocations/filtering.py
@@ -113,7 +113,7 @@ def check_fhir_type(ctx, x, tp):
     if tp == "integer" and isinstance(x, int) and not isinstance(x, bool):
         return True
 
-    if tp == "decimal" and isinstance(x, (int, Decimal)) and not isinstance(x, bool):
+    if tp == "decimal" and isinstance(x, Decimal):
         return True
 
     return False