diff --git a/c3.js b/c3.js
index e02dc45..07f2d13 100644
--- a/c3.js
+++ b/c3.js
@@ -520,7 +520,7 @@
             return x(d.x);
         }
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+            return x(isTimeSeries ? parseDate(d.value) : d.value);
         }
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             return y(d.value);
diff --git a/c3.min.js b/c3.min.js
index 9d6fea4..0511e49 100644
--- a/c3.min.js
+++ b/c3.min.js
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