diff --git a/calculator/calculator.app.js b/calculator/calculator.app.js
index 368969c..67a1e7b 100644
--- a/calculator/calculator.app.js
+++ b/calculator/calculator.app.js
@@ -586,6 +586,9 @@ function buttonPress(val) {
       break;
     case '.':
       Bangle.buzz(30);
+      if (currNumber != null && currNumber.toString().indexOf('.') !== -1) {
+        break;
+      }
       specials.R.val = 'C';
       if (!swipeEnabled) drawKey('R', specials.R);
       isDecimal = true;