diff --git a/client/client_state.C b/client/client_state.C
index 708429f930..ef62cb268b 100644
--- a/client/client_state.C
+++ b/client/client_state.C
@@ -334,6 +334,7 @@ int CLIENT_STATE::allowed_disk_usage(double& size) {
     // Return the minimum of the three
     //
     size = min(min(global_prefs.disk_max_used_gb*1e9, percent_space), min_val);
+	if(size < 0) size = 0;
     return 0;
 }