diff --git a/client/src/components/Upload/RulesInput.vue b/client/src/components/Upload/RulesInput.vue
index e4b2aba35a0e..bdf6e88bbbad 100644
--- a/client/src/components/Upload/RulesInput.vue
+++ b/client/src/components/Upload/RulesInput.vue
@@ -132,7 +132,11 @@ export default {
                 .get(
                     `${getAppRoot()}api/histories/${
                         Galaxy.currHistoryPanel.model.id
-                    }/contents/${selectedDatasetId}/display`
+                    }/contents/${selectedDatasetId}/display`,
+                    // The Rule builder expects strings, we should not parse the respone to the default JSON type
+                    {
+                        responseType: "text",
+                    }
                 )
                 .then((response) => {
                     this.sourceContent = response.data;