diff --git a/lib/math-trig.js b/lib/math-trig.js
index cb186fc6..071e5d0c 100644
--- a/lib/math-trig.js
+++ b/lib/math-trig.js
@@ -346,7 +346,7 @@ exports.FLOOR = function(number, significance) {
   if (number >= 0) {
     return exports.ROUND(Math.floor(number / significance) * significance, precision);
   } else {
-    return -exports.ROUND(Math.ceil(Math.abs(number) / significance), precision);
+    return -exports.ROUND(Math.ceil(Math.abs(number) / significance) * significance, precision);
   }
 };