diff --git a/librpc/idl/svcctl.idl b/librpc/idl/svcctl.idl
index 2f461d68898..8bbf5142886 100644
--- a/librpc/idl/svcctl.idl
+++ b/librpc/idl/svcctl.idl
@@ -156,9 +156,9 @@ import "misc.idl", "security.idl";
 	/* Function 0x04 */
 	WERROR svcctl_QueryServiceObjectSecurity(
 		[in] policy_handle *handle,
-		[in] uint32 security_flags,
-		[out,ref,size_is(buffer_size)] uint8 *buffer,
-		[in,range(0,0x40000)] uint32 buffer_size,
+		[in] security_secinfo security_flags,
+		[out,ref,size_is(offered)] uint8 *buffer,
+		[in,range(0,0x40000)] uint32 offered,
 		[out,ref,range(0,0x40000)] uint32 *needed
 	);
 
@@ -166,9 +166,9 @@ import "misc.idl", "security.idl";
 	/* Function 0x05 */
 	WERROR svcctl_SetServiceObjectSecurity(
 		[in] policy_handle *handle,
-		[in] uint32 security_flags,
-		[in,ref,size_is(buffer_size)] uint8 *buffer,
-		[in] uint32 buffer_size
+		[in] security_secinfo security_flags,
+		[in,ref,size_is(offered)] uint8 *buffer,
+		[in] uint32 offered
 	);
 
 	/*****************/