1 files changed, 11 insertions, 0 deletions
diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index df07aee9b..03294b7fe 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -243,6 +243,14 @@ void MaxBuildJobsSetting::set(const std::string & str, bool append)
 }
 
 
+void PluginFilesSetting::set(const std::string & str, bool append)
+{
+    if (pluginsLoaded)
+        throw UsageError("plugin-files set after plugins were loaded, you may need to move the flag before the subcommand");
+    BaseSetting<Paths>::set(str, append);
+}
+
+
 void initPlugins()
 {
     for (const auto & pluginFile : settings.pluginFiles.get()) {
@@ -270,6 +278,9 @@ void initPlugins()
        unknown settings. */
     globalConfig.reapplyUnknownSettings();
     globalConfig.warnUnknownSettings();
+
+    /* Tell the user if they try to set plugin-files after we've already loaded */
+    settings.pluginFiles.pluginsLoaded = true;
 }
 
 }