diff --git a/src/libvirt-admin.c b/src/libvirt-admin.c
index a94f5dd1d30312a315b8bfaa6ca65828f35c8b22..4ad816b1fc229a2448f7cb7645c2dc5a331e967d 100644
--- a/src/libvirt-admin.c
+++ b/src/libvirt-admin.c
@@ -838,6 +838,7 @@ virAdmServerSetThreadPoolParameters(virAdmServerPtr srv,
 
     virCheckAdmServerReturn(srv, -1);
     virCheckNonNullArgGoto(params, error);
+    virCheckNonNegativeArgGoto(nparams, error);
 
     if (remoteAdminServerSetThreadPoolParameters(srv, params,
                                                  nparams, flags) < 0)