diff --git a/histogramchart/schemas/histogram.cue b/histogramchart/schemas/histogram.cue
index cb7bc3da..49b59faf 100644
--- a/histogramchart/schemas/histogram.cue
+++ b/histogramchart/schemas/histogram.cue
@@ -21,7 +21,10 @@ kind: "HistogramChart"
 spec: close({
 	format?:     common.#format
 	min?:        number
-	max?:        number & >= min
+	max?:        number
+	if min != _|_ && max != _|_ {
+		max: >= min
+	}
 	thresholds?: common.#thresholds
 	logBase?:    2 | 10
 })
diff --git a/histogramchart/schemas/tests/valid/histogram_only_max.json b/histogramchart/schemas/tests/valid/histogram_only_max.json
new file mode 100644
index 00000000..e9927a4b
--- /dev/null
+++ b/histogramchart/schemas/tests/valid/histogram_only_max.json
@@ -0,0 +1,6 @@
+{
+  "kind": "HistogramChart",
+  "spec": {
+    "max": 10
+  }
+}