diff --git a/lib/iob/calculate.js b/lib/iob/calculate.js
index 2686cf135..ba808692f 100644
--- a/lib/iob/calculate.js
+++ b/lib/iob/calculate.js
@@ -110,7 +110,7 @@ function iobCalcExponential(treatment, minsAgo, dia, peak, profile) {
             peak = 55;
         }
     } else {
-        console.error('Curve of',curve,'is not supported.');
+        console.error('Curve of',profile.curve,'is not supported.');
     }
     var end = dia * 60;  // end of insulin activity, in minutes