diff --git a/fhir/resources/STU3/fhirtypes.py b/fhir/resources/STU3/fhirtypes.py
index 28ee9d3e..0dda8d3d 100644
--- a/fhir/resources/STU3/fhirtypes.py
+++ b/fhir/resources/STU3/fhirtypes.py
@@ -371,7 +371,7 @@ class Url(AnyUrl, Primitive):
     Common URL protocols are http{s}:, ftp:, mailto: and mllp:,
     though many others are defined"""
 
-    path_regex = re.compile(r"^/(?P<resourceType>[^\s?/]+)(/[^\s?/]+)*")
+    path_regex = re.compile(r"^\/?(?P<resourceType>[^\s?\/]+)(\/[^\s?\/]+)*")
     __visit_name__ = "url"
 
     @classmethod
diff --git a/fhir/resources/fhirtypes.py b/fhir/resources/fhirtypes.py
index 61c9ef6f..125f2cd7 100644
--- a/fhir/resources/fhirtypes.py
+++ b/fhir/resources/fhirtypes.py
@@ -371,7 +371,7 @@ class Url(AnyUrl, Primitive):
     Common URL protocols are http{s}:, ftp:, mailto: and mllp:,
     though many others are defined"""
 
-    path_regex = re.compile(r"^/(?P<resourceType>[^\s?/]+)(/[^\s?/]+)*")
+    path_regex = re.compile(r"^\/?(?P<resourceType>[^\s?\/]+)(\/[^\s?\/]+)*")
     __visit_name__ = "url"
 
     @classmethod