diff --git a/src/iamexample/iamexample.py b/src/iamexample/iamexample.py
index cfc7012..1d5297e 100644
--- a/src/iamexample/iamexample.py
+++ b/src/iamexample/iamexample.py
@@ -54,7 +54,7 @@ class IAMExample:
         
         accessToken=self.getAccessToken()      
         
-        umaheaders = { "Accept" : "application/json", "Content-Type" : "application/x-www-form-urlencoded"}
+        umaheaders = { 'Accept' : 'application/json', 'Content-Type' : 'application/x-www-form-urlencoded'}
         umadata = { 'grant_type' : 'urn:ietf:params:oauth:grant-type:uma-ticket', 'audience' : context}
         
         # Get UMA token for context