diff --git a/src/main/resources/static/gr-uploadvalidator-config.js b/src/main/resources/static/gr-uploadvalidator-config.js
index 508231c..be54c1d 100644
--- a/src/main/resources/static/gr-uploadvalidator-config.js
+++ b/src/main/resources/static/gr-uploadvalidator-config.js
@@ -42,7 +42,7 @@
     },
 
     _getPreferences() {
-      return this._projectRestApi.get(`${this.repoName}/config`)
+      return this._projectRestApi.get(`${encodeURIComponent(this.repoName)}/config`)
         .then(config => {
           if (!config) {
             return;
@@ -67,7 +67,7 @@
       let body = { plugin_config_values: {} };
       body.plugin_config_values.uploadvalidator = this._changedConfig;
 
-      this._projectRestApi.put(`${this.repoName}/config`, body)
+      this._projectRestApi.put(`${encodeURIComponent(this.repoName)}/config`, body)
         .then(() => {
           this._prefsChanged = false;
         }).catch(response => {