diff --git a/girder/girder_large_image/web_client/vue/components/FrameSelector.vue b/girder/girder_large_image/web_client/vue/components/FrameSelector.vue
index 30d16f553..4563280b6 100644
--- a/girder/girder_large_image/web_client/vue/components/FrameSelector.vue
+++ b/girder/girder_large_image/web_client/vue/components/FrameSelector.vue
@@ -72,6 +72,7 @@ export default Vue.extend({
                 const mergedStyle = this.maxMergeStyle();
                 if (mergedStyle.bands.length) {
                     const simpleMergedStyleString = JSON.stringify({
+                        dtype: 'source',
                         bands: mergedStyle.bands.map((b) => ({
                             framedelta: b.framedelta,
                             band: b.band
@@ -80,7 +81,9 @@ export default Vue.extend({
                     });
                     this.histogramParamStyles[modeID] = simpleMergedStyleString;
                 } else {
-                    this.histogramParamStyles[modeID] = '{}';
+                    this.histogramParamStyles[modeID] = JSON.stringify({
+                        dtype: 'source'
+                    });
                 }
             });
         },