diff --git a/ssuks/ssukickstarter.cpp b/ssuks/ssukickstarter.cpp
index 29de002..86f81f5 100644
--- a/ssuks/ssukickstarter.cpp
+++ b/ssuks/ssukickstarter.cpp
@@ -345,12 +345,15 @@ bool SsuKickstarter::write(const QString &kickstart)
                                 : "release"))
                           .arg(repoOverride.value("version"));
 
+    // Feature names can be prefixed with '-' to inhibit implicit suggestion
     QStringList featuresList = deviceInfo.value("img-features").toStringList();
 
     // Add developer-mode feature to rnd images by default
-    if (rndMode)
+    if (rndMode && !featuresList.contains("-developer-mode"))
         featuresList << "developer-mode";
 
+    featuresList = featuresList.filter(QRegExp("^[^-]"));
+
     QString suggestedFeatures;
 
     // work around some idiotic JS list parsing on our side by terminating one-element list by comma