diff --git a/openpower/ext_interfaces/test_vmicert_management.robot b/openpower/ext_interfaces/test_vmicert_management.robot
index 9eeb34b..6092657 100644
--- a/openpower/ext_interfaces/test_vmicert_management.robot
+++ b/openpower/ext_interfaces/test_vmicert_management.robot
@@ -612,9 +612,8 @@
 
     # For SignCSR request, we need to pass CSR string generated by openssl command.
     ${csr_data}=  Create Dictionary  CsrString  ${csr}
-    Set To Dictionary  ${data}  data  ${csr_data}
 
-    ${resp}=  POST On Session  openbmc  ${cert_uri}  &{data}  headers=${headers}
+    ${resp}=  POST On Session  openbmc  ${cert_uri}  json=${csr_data}  headers=${headers}
     ...  timeout=${read_timeout}  expected_status=any
     Log to console  ${resp.content}