diff --git a/c3.js b/c3.js
index 1ed3478..47b293e 100644
--- a/c3.js
+++ b/c3.js
@@ -1150,7 +1150,7 @@
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         function classCircle(d, i) { return classShape(d, i) + " -circle -circle-" + i; }
         function classBar(d, i) { return classShape(d, i) + " -bar -bar-" + i; }
-        function classRegion(d, i) { return 'region region-' + i + ' ' + ('classes' in d ? [].concat(d.classes).join(' ') : ''); }
+        function classRegion(d, i) { return 'region region-' + i + ' ' + ('class' in d ? d.class : ''); }
         function classEvent(d, i) { return "event-rect event-rect-" + i; }
 
         function initialOpacity(d) {
diff --git a/c3.min.js b/c3.min.js
index e5443a1..b882c10 100644
--- a/c3.min.js
+++ b/c3.min.js
@@ -1,2 +1,2 @@
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