diff --git a/dlls/secur32/ntlm.c b/dlls/secur32/ntlm.c
index feaef9b2d4e..86aa0b66d30 100644
--- a/dlls/secur32/ntlm.c
+++ b/dlls/secur32/ntlm.c
@@ -1005,7 +1005,9 @@ static SECURITY_STATUS SEC_ENTRY ntlm_DeleteSecurityContext(PCtxtHandle phContex
     TRACE("%p\n", phContext);
     if (phContext)
     {
-        ret = SEC_E_UNSUPPORTED_FUNCTION;
+        phContext->dwUpper = 0;
+        phContext->dwLower = 0;
+        ret = SEC_E_OK;
     }
     else
     {