diff --git a/js/bigwig/bwReader.js b/js/bigwig/bwReader.js
index 87c6af6c0..c6438b45f 100644
--- a/js/bigwig/bwReader.js
+++ b/js/bigwig/bwReader.js
@@ -91,7 +91,7 @@ class BWReader {
             // Select a biwig "zoom level" appropriate for the current resolution.
             const zoomLevelHeaders = await this.getZoomHeaders()
             let zoomLevelHeader = bpPerPixel ? zoomLevelForScale(bpPerPixel, zoomLevelHeaders) : undefined
-            if (zoomLevelHeader) {
+            if (zoomLevelHeader && windowFunction != "none") {
                 treeOffset = zoomLevelHeader.indexOffset
                 decodeFunction = decodeZoomData
             } else {
diff --git a/js/bigwig/bwSource.js b/js/bigwig/bwSource.js
index 4afeba93f..5cd809f3f 100755
--- a/js/bigwig/bwSource.js
+++ b/js/bigwig/bwSource.js
@@ -31,7 +31,7 @@ class BWSource extends BaseFeatureSource {
 
     queryable = true
     #wgValues = {}
-    windowFunctions = ["mean", "min", "max"]
+    windowFunctions = ["mean", "min", "max", "none"]
 
     constructor(config, genome) {
         super(genome)