diff --git a/client/app/scripts/utils/string-utils.js b/client/app/scripts/utils/string-utils.js
index 0687bc0ff..7f19f4f9e 100644
--- a/client/app/scripts/utils/string-utils.js
+++ b/client/app/scripts/utils/string-utils.js
@@ -65,7 +65,7 @@ export const formatMetric = makeFormatMetric(renderHtml);
 export const formatMetricSvg = makeFormatMetric(renderSvg);
 export const formatDate = d3.time.format.iso;
 
-const CLEAN_LABEL_REGEX = /[^A-Za-z]/g;
+const CLEAN_LABEL_REGEX = /[^A-Za-z0-9]/g;
 export function slugify(label) {
   return label.replace(CLEAN_LABEL_REGEX, '').toLowerCase();
 }