diff --git a/examples/libraries/entitySelectionTool.js b/examples/libraries/entitySelectionTool.js
index e37171c92a..478782c6ec 100644
--- a/examples/libraries/entitySelectionTool.js
+++ b/examples/libraries/entitySelectionTool.js
@@ -200,9 +200,10 @@ SelectionManager = (function() {
     return that;
 })();
 
+// Normalize degrees to be in the range (-180, 180]
 function normalizeDegrees(degrees) {
     while (degrees > 180) degrees -= 360;
-    while (degrees < -180) degrees += 360;
+    while (degrees <= -180) degrees += 360;
     return degrees;
 }