diff --git a/dist/uPlot.cjs.js b/dist/uPlot.cjs.js
index 84a48940..de17ad14 100644
--- a/dist/uPlot.cjs.js
+++ b/dist/uPlot.cjs.js
@@ -2716,7 +2716,7 @@ function uPlot(opts, data, then) {
 		legendCols = multiValLegend ? getMultiVals(self, 1, 0) : {_: 0};
 
 		for (let k in legendCols)
-			NULL_LEGEND_VALUES[k] = "--";
+			NULL_LEGEND_VALUES[k] = "—";
 	}
 
 	if (showLegend) {
@@ -2803,7 +2803,7 @@ function uPlot(opts, data, then) {
 
 		for (var key in legendCols) {
 			let v = placeTag("td", LEGEND_VALUE, row);
-			v.textContent = "--";
+			v.textContent = "—";
 			cells.push(v);
 		}
 
diff --git a/dist/uPlot.esm.js b/dist/uPlot.esm.js
index f7c486d5..cc8a2644 100644
--- a/dist/uPlot.esm.js
+++ b/dist/uPlot.esm.js
@@ -2714,7 +2714,7 @@ function uPlot(opts, data, then) {
 		legendCols = multiValLegend ? getMultiVals(self, 1, 0) : {_: 0};
 
 		for (let k in legendCols)
-			NULL_LEGEND_VALUES[k] = "--";
+			NULL_LEGEND_VALUES[k] = "—";
 	}
 
 	if (showLegend) {
@@ -2801,7 +2801,7 @@ function uPlot(opts, data, then) {
 
 		for (var key in legendCols) {
 			let v = placeTag("td", LEGEND_VALUE, row);
-			v.textContent = "--";
+			v.textContent = "—";
 			cells.push(v);
 		}
 
diff --git a/dist/uPlot.iife.js b/dist/uPlot.iife.js
index e0e776c7..3afc8c54 100644
--- a/dist/uPlot.iife.js
+++ b/dist/uPlot.iife.js
@@ -2717,7 +2717,7 @@ var uPlot = (function () {
 			legendCols = multiValLegend ? getMultiVals(self, 1, 0) : {_: 0};
 
 			for (let k in legendCols)
-				NULL_LEGEND_VALUES[k] = "--";
+				NULL_LEGEND_VALUES[k] = "—";
 		}
 
 		if (showLegend) {
@@ -2804,7 +2804,7 @@ var uPlot = (function () {
 
 			for (var key in legendCols) {
 				let v = placeTag("td", LEGEND_VALUE, row);
-				v.textContent = "--";
+				v.textContent = "—";
 				cells.push(v);
 			}
 
@@ -5212,4 +5212,4 @@ var uPlot = (function () {
 
 	return uPlot;
 
-})();
+}());
diff --git a/dist/uPlot.iife.min.js b/dist/uPlot.iife.min.js
index 0403c326..214cc890 100644
--- a/dist/uPlot.iife.min.js
+++ b/dist/uPlot.iife.min.js
@@ -1,2 +1,2 @@
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e=1==k?i:o;e>=i&&o>=e;e+=k){let t=u[e],l=f(r[e],a,m,d);null!=t?(y&&(el(v,S,l),y=!1),E.push(S=l),D.push(h(u[e],c,g,p))):null===t&&(el(v,S,l),y=!0)}const T={stroke:e(E,D,x,_,w,b),fill:null,clip:null,band:null,gaps:null,flags:1},z=T.stroke;if(null!=s.fill&&null!=z){let e=T.fill=new Path2D(z),t=b(h(s.fillTo(l,n,s.min,s.max),c,g,p));_(e,S,t),_(e,M,t)}return T.gaps=v=s.gaps(l,n,i,o,v),s.spanGaps||(T.clip=Qt(v,a.ori,d,p,m,g)),l.bands.length>0&&(T.band=Xt(l,n,i,o,z)),T}))}(wl)}}return Fl}();
diff --git a/src/uPlot.js b/src/uPlot.js
index 45c78746..aee0a816 100644
--- a/src/uPlot.js
+++ b/src/uPlot.js
@@ -553,7 +553,7 @@ export default function uPlot(opts, data, then) {
 		legendCols = multiValLegend ? getMultiVals(self, 1, 0) : {_: 0};
 
 		for (let k in legendCols)
-			NULL_LEGEND_VALUES[k] = "--";
+			NULL_LEGEND_VALUES[k] = "—";
 	}
 
 	if (showLegend) {
@@ -640,7 +640,7 @@ export default function uPlot(opts, data, then) {
 
 		for (var key in legendCols) {
 			let v = placeTag("td", LEGEND_VALUE, row);
-			v.textContent = "--";
+			v.textContent = "—";
 			cells.push(v);
 		}